diff --git a/exercises/practice/bob/.meta/tests.toml b/exercises/practice/bob/.meta/tests.toml
index 5299e289..c6a46496 100644
--- a/exercises/practice/bob/.meta/tests.toml
+++ b/exercises/practice/bob/.meta/tests.toml
@@ -9,17 +9,20 @@
 # As user-added comments (using the # character) will be removed when this file
 # is regenerated, comments can be added via a `comment` key.
 
-[e162fead-606f-437a-a166-d051915cea8e]
-description = "stating something"
+[8a2e771d-d6f1-4e3f-b6c6-b41495556e37]
+description = "asking a question"
 
 [73a966dc-8017-47d6-bb32-cf07d1a5fcd9]
 description = "shouting"
 
-[d6c98afd-df35-4806-b55e-2c457c3ab748]
-description = "shouting gibberish"
+[a5193c61-4a92-4f68-93e2-f554eb385ec6]
+description = "forceful question"
 
-[8a2e771d-d6f1-4e3f-b6c6-b41495556e37]
-description = "asking a question"
+[bc39f7c6-f543-41be-9a43-fd1c2f753fc0]
+description = "silence"
+
+[e162fead-606f-437a-a166-d051915cea8e]
+description = "stating something"
 
 [81080c62-4e4d-4066-b30a-48d8d76920d9]
 description = "asking a numeric question"
@@ -27,23 +30,34 @@ description = "asking a numeric question"
 [2a02716d-685b-4e2e-a804-2adaf281c01e]
 description = "asking gibberish"
 
-[c02f9179-ab16-4aa7-a8dc-940145c385f7]
-description = "talking forcefully"
+[bb0011c5-cd52-4a5b-8bfb-a87b6283b0e2]
+description = "question with no letters"
 
-[153c0e25-9bb5-4ec5-966e-598463658bcd]
-description = "using acronyms in regular speech"
+[9bfc677d-ea3a-45f2-be44-35bc8fa3753e]
+description = "non-letters with question"
 
-[a5193c61-4a92-4f68-93e2-f554eb385ec6]
-description = "forceful question"
+[8608c508-f7de-4b17-985b-811878b3cf45]
+description = "prattling on"
 
-[a20e0c54-2224-4dde-8b10-bd2cdd4f61bc]
-description = "shouting numbers"
+[05b304d6-f83b-46e7-81e0-4cd3ca647900]
+description = "ending with whitespace"
 
-[f7bc4b92-bdff-421e-a238-ae97f230ccac]
-description = "no letters"
+[66953780-165b-4e7e-8ce3-4bcb80b6385a]
+description = "multiple line question"
+include = false
 
-[bb0011c5-cd52-4a5b-8bfb-a87b6283b0e2]
-description = "question with no letters"
+[2c7278ac-f955-4eb4-bf8f-e33eb4116a15]
+description = "multiple line question"
+reimplements = "66953780-165b-4e7e-8ce3-4bcb80b6385a"
+
+[d6c98afd-df35-4806-b55e-2c457c3ab748]
+description = "shouting gibberish"
+
+[3c954328-86fb-4c71-8961-e18d6a5e2517]
+description = "shouting a statement containing a question mark"
+
+[a20e0c54-2224-4dde-8b10-bd2cdd4f61bc]
+description = "shouting numbers"
 
 [496143c8-1c31-4c01-8a08-88427af85c66]
 description = "shouting with special characters"
@@ -51,40 +65,29 @@ description = "shouting with special characters"
 [e6793c1c-43bd-4b8d-bc11-499aea73925f]
 description = "shouting with no exclamation mark"
 
-[aa8097cc-c548-4951-8856-14a404dd236a]
-description = "statement containing question mark"
-
-[9bfc677d-ea3a-45f2-be44-35bc8fa3753e]
-description = "non-letters with question"
-
-[8608c508-f7de-4b17-985b-811878b3cf45]
-description = "prattling on"
-
-[bc39f7c6-f543-41be-9a43-fd1c2f753fc0]
-description = "silence"
-
 [d6c47565-372b-4b09-b1dd-c40552b8378b]
 description = "prolonged silence"
 
 [4428f28d-4100-4d85-a902-e5a78cb0ecd3]
 description = "alternate silence"
 
-[66953780-165b-4e7e-8ce3-4bcb80b6385a]
-description = "multiple line question"
-include = false
+[72bd5ad3-9b2f-4931-a988-dce1f5771de2]
+description = "other whitespace"
 
-[5371ef75-d9ea-4103-bcfa-2da973ddec1b]
-description = "starting with whitespace"
+[c02f9179-ab16-4aa7-a8dc-940145c385f7]
+description = "talking forcefully"
 
-[05b304d6-f83b-46e7-81e0-4cd3ca647900]
-description = "ending with whitespace"
+[153c0e25-9bb5-4ec5-966e-598463658bcd]
+description = "using acronyms in regular speech"
 
-[72bd5ad3-9b2f-4931-a988-dce1f5771de2]
-description = "other whitespace"
+[f7bc4b92-bdff-421e-a238-ae97f230ccac]
+description = "no letters"
+
+[aa8097cc-c548-4951-8856-14a404dd236a]
+description = "statement containing question mark"
+
+[5371ef75-d9ea-4103-bcfa-2da973ddec1b]
+description = "starting with whitespace"
 
 [12983553-8601-46a8-92fa-fcaa3bc4a2a0]
 description = "non-question ending with whitespace"
-
-[2c7278ac-f955-4eb4-bf8f-e33eb4116a15]
-description = "multiple line question"
-reimplements = "66953780-165b-4e7e-8ce3-4bcb80b6385a"
diff --git a/exercises/practice/bob/BobResponse.tests.ps1 b/exercises/practice/bob/BobResponse.tests.ps1
index f0a962e8..93996587 100644
--- a/exercises/practice/bob/BobResponse.tests.ps1
+++ b/exercises/practice/bob/BobResponse.tests.ps1
@@ -4,20 +4,24 @@ BeforeAll {
 
 Describe "Test Get-BobResponse" {
 
-    It "stating something" {
-        Get-BobResponse -HeyBob "Tom-ay-to, tom-aaaah-to." | Should -BeExactly "Whatever."
+    It "asking a question" {
+        Get-BobResponse -HeyBob "Does this cryogenic chamber make me look fat?" | Should -BeExactly "Sure."
     }
 
     It "shouting" {
         Get-BobResponse -HeyBob "WATCH OUT!" | Should -BeExactly "Whoa, chill out!"
     }
 
-    It "shouting gibberish" {
-        Get-BobResponse -HeyBob "FCECDFCAAB" | Should -BeExactly "Whoa, chill out!"
+    It "forceful question" {
+        Get-BobResponse -HeyBob "WHAT'S GOING ON?" | Should -BeExactly "Calm down, I know what I'm doing!"
     }
 
-    It "asking a question" {
-        Get-BobResponse -HeyBob "Does this cryogenic chamber make me look fat?" | Should -BeExactly "Sure."
+    It "silence" {
+        Get-BobResponse -HeyBob "" | Should -BeExactly "Fine. Be that way!"
+    }
+
+    It "stating something" {
+        Get-BobResponse -HeyBob "Tom-ay-to, tom-aaaah-to." | Should -BeExactly "Whatever."
     }
 
     It "asking a numeric question" {
@@ -28,78 +32,78 @@ Describe "Test Get-BobResponse" {
         Get-BobResponse -HeyBob "fffbbcbeab?" | Should -BeExactly "Sure."
     }
 
-    It "talking forcefully" {
-        Get-BobResponse -HeyBob "Let's go make out behind the gym!" | Should -BeExactly "Whatever."
+    It "question with no letters" {
+        Get-BobResponse -HeyBob "4?" | Should -BeExactly "Sure."
     }
 
-    It "using acronyms in regular speech" {
-        Get-BobResponse -HeyBob "It's OK if you don't want to go to the DMV." | Should -BeExactly "Whatever."
+    It "non-letters with question" {
+        Get-BobResponse -HeyBob ":) ?" | Should -BeExactly "Sure."
     }
 
-    It "forceful question" {
-        Get-BobResponse -HeyBob "WHAT THE HELL WERE YOU THINKING?" | Should -BeExactly "Calm down, I know what I'm doing!"
+    It "prattling on" {
+        Get-BobResponse -HeyBob "Wait! Hang on. Are you going to be OK?" | Should -BeExactly "Sure."
     }
 
-    It "shouting numbers" {
-        Get-BobResponse -HeyBob "1, 2, 3 GO!" | Should -BeExactly "Whoa, chill out!"
+    It "ending with whitespace" {
+        Get-BobResponse -HeyBob "Okay if like my  spacebar  quite a bit?   " | Should -BeExactly "Sure."
     }
 
-    It "no letters" {
-        Get-BobResponse -HeyBob "1, 2, 3" | Should -BeExactly "Whatever."
+    It "multiple line question" {
+        Get-BobResponse -HeyBob "`nDoes this cryogenic chamber make`n me look fat?" | Should -BeExactly "Sure."
     }
 
-    It "question with no letters" {
-        Get-BobResponse -HeyBob "4?" | Should -BeExactly "Sure."
+    It "shouting gibberish" {
+        Get-BobResponse -HeyBob "FCECDFCAAB" | Should -BeExactly "Whoa, chill out!"
+    }
+
+    It "shouting a statement containing a question mark" {
+        Get-BobResponse -HeyBob "DO LIONS EAT PEOPLE? AHHHHH." | Should -BeExactly "Whoa, chill out!"
     }
 
+    It "shouting numbers" {
+        Get-BobResponse -HeyBob "1, 2, 3 GO!" | Should -BeExactly "Whoa, chill out!"
+    }
+    
     It "shouting with special characters" {
         Get-BobResponse -HeyBob "ZOMG THE %^*@#`$(*^ ZOMBIES ARE COMING!!11!!1!" | Should -BeExactly "Whoa, chill out!"
     }
 
     It "shouting with no exclamation mark" {
-        Get-BobResponse -HeyBob "I HATE YOU" | Should -BeExactly "Whoa, chill out!"
+        Get-BobResponse -HeyBob "I HATE THE DENTIST" | Should -BeExactly "Whoa, chill out!"
     }
 
-    It "statement containing question mark" {
-        Get-BobResponse -HeyBob "Ending with ? means a question." | Should -BeExactly "Whatever."
+    It "prolonged silence" {
+        Get-BobResponse -HeyBob "          " | Should -BeExactly "Fine. Be that way!"
     }
 
-    It "non-letters with question" {
-        Get-BobResponse -HeyBob ":) ?" | Should -BeExactly "Sure."
+    It "alternate silence" {
+        Get-BobResponse -HeyBob "`t`t`t`t`t`t`t`t`t`t`t" | Should -BeExactly "Fine. Be that way!"
     }
 
-    It "prattling on" {
-        Get-BobResponse -HeyBob "Wait! Hang on. Are you going to be OK?" | Should -BeExactly "Sure."
+    It "other whitespace" {
+        Get-BobResponse -HeyBob "`n`r `t" | Should -BeExactly "Fine. Be that way!"
     }
 
-    It "silence" {
-        Get-BobResponse -HeyBob "" | Should -BeExactly "Fine. Be that way!"
+    It "talking forcefully" {
+        Get-BobResponse -HeyBob "Hi there!" | Should -BeExactly "Whatever."
     }
 
-    It "prolonged silence" {
-        Get-BobResponse -HeyBob "          " | Should -BeExactly "Fine. Be that way!"
+    It "using acronyms in regular speech" {
+        Get-BobResponse -HeyBob "It's OK if you don't want to go work for NASA." | Should -BeExactly "Whatever."
     }
 
-    It "alternate silence" {
-        Get-BobResponse -HeyBob "`t`t`t`t`t`t`t`t`t`t`t" | Should -BeExactly "Fine. Be that way!"
+    It "no letters" {
+        Get-BobResponse -HeyBob "1, 2, 3" | Should -BeExactly "Whatever."
     }
 
-    It "multiple line question" {
-        Get-BobResponse -HeyBob "`nDoes this cryogenic chamber make`n me look fat?" | Should -BeExactly "Sure."
+    It "statement containing question mark" {
+        Get-BobResponse -HeyBob "Ending with ? means a question." | Should -BeExactly "Whatever."
     }
 
     It "starting with whitespace" {
         Get-BobResponse -HeyBob "         hmmmmmmm..." | Should -BeExactly "Whatever."
     }
 
-    It "ending with whitespace" {
-        Get-BobResponse -HeyBob "Okay if like my  spacebar  quite a bit?   " | Should -BeExactly "Sure."
-    }
-
-    It "other whitespace" {
-        Get-BobResponse -HeyBob "`n`r `t" | Should -BeExactly "Fine. Be that way!"
-    }
-
     It "non-question ending with whitespace" {
         Get-BobResponse -HeyBob "This is a statement ending with whitespace      " | Should -BeExactly "Whatever."
     }
diff --git a/exercises/practice/connect/.meta/tests.toml b/exercises/practice/connect/.meta/tests.toml
index 6ada8773..951b87e5 100644
--- a/exercises/practice/connect/.meta/tests.toml
+++ b/exercises/practice/connect/.meta/tests.toml
@@ -30,6 +30,12 @@ description = "nobody wins crossing adjacent angles"
 [cd61c143-92f6-4a8d-84d9-cb2b359e226b]
 description = "X wins crossing from left to right"
 
+[495e33ed-30a9-4012-b46e-d7c4d5fe13c3]
+description = "X wins with left-hand dead end fork"
+
+[ab167ab0-4a98-4d0f-a1c0-e1cddddc3d58]
+description = "X wins with right-hand dead end fork"
+
 [73d1eda6-16ab-4460-9904-b5f5dd401d0b]
 description = "O wins crossing from top to bottom"
 
diff --git a/exercises/practice/connect/Connect.tests.ps1 b/exercises/practice/connect/Connect.tests.ps1
index 3954ca64..24877a64 100644
--- a/exercises/practice/connect/Connect.tests.ps1
+++ b/exercises/practice/connect/Connect.tests.ps1
@@ -78,6 +78,32 @@ Describe "Connect test cases" {
         $got | Should -BeExactly $want
     }
 
+    It "X wins with left-hand dead end fork" {
+        $board = @(
+            ". . X .",
+            " X X . .",
+            "  . X X X",
+            "   O O O O"
+        )
+        $got  = [Connect]::new($board).GetWinner()
+        $want = [Winner]::X
+
+        $got | Should -BeExactly $want
+    }
+
+    It "X wins with right-hand dead end fork" {
+        $board = @(
+            ". . X X",
+            " X X . .",
+            "  . X X .",
+            "   O O O O"
+        )
+        $got  = [Connect]::new($board).GetWinner()
+        $want = [Winner]::X
+
+        $got | Should -BeExactly $want
+    }
+
     It "X wins crossing from left to right" {
         $board = @(
             ". O . .",
diff --git a/exercises/practice/flower-field/.meta/tests.toml b/exercises/practice/flower-field/.meta/tests.toml
index c2b24fda..965ba8fd 100644
--- a/exercises/practice/flower-field/.meta/tests.toml
+++ b/exercises/practice/flower-field/.meta/tests.toml
@@ -44,3 +44,6 @@ description = "cross"
 
 [dd9d4ca8-9e68-4f78-a677-a2a70fd7a7b8]
 description = "large garden"
+
+[6e4ac13a-3e43-4728-a2e3-3551d4b1a996]
+description = "multiple adjacent flowers"
diff --git a/exercises/practice/flower-field/FlowerField.tests.ps1 b/exercises/practice/flower-field/FlowerField.tests.ps1
index 4dc9a1e9..499a01dc 100644
--- a/exercises/practice/flower-field/FlowerField.tests.ps1
+++ b/exercises/practice/flower-field/FlowerField.tests.ps1
@@ -168,6 +168,17 @@ Describe "Flower Field test cases" {
         $got | Should -BeExactly $want
     }
 
+    It "multiple adjacent flowers" {
+        $got  = Get-Annotate -Garden @(
+            " ** "
+        )
+        $want = @(
+            "1**1"
+        )
+
+        $got | Should -BeExactly $want
+    }
+
     It "annotate 9" {
         $got  = Get-Annotate -Garden @(
             "     ", 
diff --git a/exercises/practice/isbn-verifier/.meta/tests.toml b/exercises/practice/isbn-verifier/.meta/tests.toml
index 6d5a8459..17e18d47 100644
--- a/exercises/practice/isbn-verifier/.meta/tests.toml
+++ b/exercises/practice/isbn-verifier/.meta/tests.toml
@@ -30,6 +30,12 @@ description = "invalid character in isbn is not treated as zero"
 [28025280-2c39-4092-9719-f3234b89c627]
 description = "X is only valid as a check digit"
 
+[8005b57f-f194-44ee-88d2-a77ac4142591]
+description = "only one check digit is allowed"
+
+[fdb14c99-4cf8-43c5-b06d-eb1638eff343]
+description = "X is not substituted by the value 10"
+
 [f6294e61-7e79-46b3-977b-f48789a4945b]
 description = "valid isbn without separating dashes"
 
diff --git a/exercises/practice/isbn-verifier/IsbnVerifier.tests.ps1 b/exercises/practice/isbn-verifier/IsbnVerifier.tests.ps1
index fbf15e51..d4bc65fa 100644
--- a/exercises/practice/isbn-verifier/IsbnVerifier.tests.ps1
+++ b/exercises/practice/isbn-verifier/IsbnVerifier.tests.ps1
@@ -45,6 +45,18 @@ Describe "IsbnVerifierTests" {
         $got | Should -BeFalse
     }
 
+    It "only one check digit is allowed" {
+        $got = Test-Isbn -Isbn "3-598-21508-96"
+
+        $got | Should -BeFalse
+    }
+
+    It "X is not substituted by the value 10" {
+        $got = Test-Isbn -Isbn "3-598-2X507-5"
+
+        $got | Should -BeFalse
+    }
+
     It "valid isbn without separating dashes" {
         $got = Test-Isbn -Isbn "3598215088"
 
diff --git a/exercises/practice/line-up/.meta/tests.toml b/exercises/practice/line-up/.meta/tests.toml
index 36fdf1d0..dd66fc15 100644
--- a/exercises/practice/line-up/.meta/tests.toml
+++ b/exercises/practice/line-up/.meta/tests.toml
@@ -51,9 +51,24 @@ description = "format non-exceptional ordinal numeral 13"
 [2bdcebc5-c029-4874-b6cc-e9bec80d603a]
 description = "format exceptional ordinal numeral 21"
 
+[a98e2e22-ab41-4557-a7c2-efedc19c16da]
+description = "format exceptional ordinal numeral 22 ending in nd even though it is a multiple of 11"
+
+[ab45d2fb-e0ee-4016-b605-76917584db0a]
+description = "format exceptional ordinal numeral 33 ending in rd even though it is a multiple of 11"
+
+[c9243603-9f17-45b3-9a41-db9ebdbf08e1]
+description = "format exceptional ordinal numeral 52 ending in nd even though it is a multiple of 13"
+
 [74ee2317-0295-49d2-baf0-d56bcefa14e3]
 description = "format exceptional ordinal numeral 62"
 
+[3f6c408c-4331-42b6-bb6c-3ad0823e568a]
+description = "format non-exceptional ordinal numeral 72 ending in nd even though it is a multiple of 12"
+
+[8db52cd9-9689-413f-a812-6c36fcfd0d07]
+description = "format exceptional ordinal numeral 91 ending in st even though it is a multiple of 13"
+
 [b37c332d-7f68-40e3-8503-e43cbd67a0c4]
 description = "format exceptional ordinal numeral 100"
 
@@ -65,3 +80,6 @@ description = "format non-exceptional ordinal numeral 112"
 
 [06b62efe-199e-4ce7-970d-4bf73945713f]
 description = "format exceptional ordinal numeral 123"
+
+[6792c54e-59a7-4faf-839a-c4bb61014229]
+description = "format large number 972 ending in nd even though it is a multiple of 12"
diff --git a/exercises/practice/line-up/LineUp.tests.ps1 b/exercises/practice/line-up/LineUp.tests.ps1
index 02485274..c0fd44d6 100644
--- a/exercises/practice/line-up/LineUp.tests.ps1
+++ b/exercises/practice/line-up/LineUp.tests.ps1
@@ -101,6 +101,27 @@ Describe "LineUp test cases" {
         $got | Should -BeExactly $expect
     }
 
+    It "format exceptional ordinal numeral 22" {
+        $got = Get-LineUp -Name "Ingrid" -Number 22
+        $expect = "Ingrid, you are the 22nd customer we serve today. Thank you!"
+        
+        $got | Should -BeExactly $expect
+    }
+
+    It "format exceptional ordinal numeral 33 ending in rd even though it is a multiple of 112" {
+        $got = Get-LineUp -Name "Mario" -Number 33
+        $expect = "Mario, you are the 33rd customer we serve today. Thank you!"
+        
+        $got | Should -BeExactly $expect
+    }
+
+    It "format exceptional ordinal numeral 52 ending in nd even though it is a multiple of 13" {
+        $got = Get-LineUp -Name "Quentin" -Number 52
+        $expect = "Quentin, you are the 52nd customer we serve today. Thank you!"
+        
+        $got | Should -BeExactly $expect
+    }
+
     It "format exceptional ordinal numeral 62" {
         $got = Get-LineUp -Name "Nayra" -Number 62
         $expect = "Nayra, you are the 62nd customer we serve today. Thank you!"
@@ -108,6 +129,20 @@ Describe "LineUp test cases" {
         $got | Should -BeExactly $expect
     }
 
+    It "format non-exceptional ordinal numeral 72 ending in nd even though it is a multiple of 12" {
+        $got = Get-LineUp -Name "Ugo" -Number 72
+        $expect = "Ugo, you are the 72nd customer we serve today. Thank you!"
+        
+        $got | Should -BeExactly $expect
+    }
+
+    It "format exceptional ordinal numeral 91 ending in st even though it is a multiple of 13" {
+        $got = Get-LineUp -Name "Boris" -Number 91
+        $expect = "Boris, you are the 91st customer we serve today. Thank you!"
+        
+        $got | Should -BeExactly $expect
+    }
+
     It "format exceptional ordinal numeral 100" {
         $got = Get-LineUp -Name "John" -Number 100
         $expect = "John, you are the 100th customer we serve today. Thank you!"
@@ -135,4 +170,11 @@ Describe "LineUp test cases" {
         
         $got | Should -BeExactly $expect
     }
+
+    It "format large number 972 ending in nd even though it is a multiple of 12" {
+        $got = Get-LineUp -Name "Elias" -Number 972
+        $expect = "Elias, you are the 972nd customer we serve today. Thank you!"
+        
+        $got | Should -BeExactly $expect
+    }
 }
diff --git a/exercises/practice/perfect-numbers/.meta/tests.toml b/exercises/practice/perfect-numbers/.meta/tests.toml
index ec288891..81d48408 100644
--- a/exercises/practice/perfect-numbers/.meta/tests.toml
+++ b/exercises/practice/perfect-numbers/.meta/tests.toml
@@ -27,6 +27,9 @@ description = "Abundant numbers -> Medium abundant number is classified correctl
 [ec7792e6-8786-449c-b005-ce6dd89a772b]
 description = "Abundant numbers -> Large abundant number is classified correctly"
 
+[05f15b93-849c-45e9-9c7d-1ea131ef7d10]
+description = "Abundant numbers -> Perfect square abundant number is classified correctly"
+
 [e610fdc7-2b6e-43c3-a51c-b70fb37413ba]
 description = "Deficient numbers -> Smallest prime deficient number is classified correctly"
 
diff --git a/exercises/practice/perfect-numbers/PerfectNumbers.tests.ps1 b/exercises/practice/perfect-numbers/PerfectNumbers.tests.ps1
index fb3ec078..7f72e444 100644
--- a/exercises/practice/perfect-numbers/PerfectNumbers.tests.ps1
+++ b/exercises/practice/perfect-numbers/PerfectNumbers.tests.ps1
@@ -39,6 +39,13 @@ Describe "Test Invoke-PerfectNumbers.ps1" {
             $got | Should -BeExactly $want
         }
 
+        It "Perfect square abundant number is classified correctly" {
+            $got = Invoke-PerfectNumbers -Number 196
+            $want = "abundant"
+
+            $got | Should -BeExactly $want
+        }
+
         It "Large abundant number is classified correctly" {
             $got = Invoke-PerfectNumbers -Number 33550335
             $want = "abundant"
diff --git a/exercises/practice/state-of-tic-tac-toe/.meta/tests.toml b/exercises/practice/state-of-tic-tac-toe/.meta/tests.toml
index 8fc25e21..5f574b2a 100644
--- a/exercises/practice/state-of-tic-tac-toe/.meta/tests.toml
+++ b/exercises/practice/state-of-tic-tac-toe/.meta/tests.toml
@@ -99,3 +99,9 @@ reimplements = "b1dc8b13-46c4-47db-a96d-aa90eedc4e8d"
 
 [4801cda2-f5b7-4c36-8317-3cdd167ac22c]
 description = "Invalid boards -> Invalid board: players kept playing after a win"
+
+[5a84757a-fc86-4328-aec9-a5759e6ed35d]
+description = "Invalid boards -> Invalid board: O kept playing after X wins"
+
+[cf25543d-583a-4656-b9ab-f82dc00a4a02]
+description = "Invalid boards -> Invalid board: X kept playing after O wins"
diff --git a/exercises/practice/state-of-tic-tac-toe/StateOfTicTacToe.tests.ps1 b/exercises/practice/state-of-tic-tac-toe/StateOfTicTacToe.tests.ps1
index 66948acc..842f82e5 100644
--- a/exercises/practice/state-of-tic-tac-toe/StateOfTicTacToe.tests.ps1
+++ b/exercises/practice/state-of-tic-tac-toe/StateOfTicTacToe.tests.ps1
@@ -271,5 +271,21 @@ Describe "StateOfTicTacToe test cases" {
 
             {Get-StateOfTicTacToe -Board $grid} | Should -Throw "*Impossible board: game should have ended after the game was won*"
         }
+
+        It "Invalid board: O kept playing after X wins" {
+            $grid = @("OO ",
+                      "XXX",
+                      " O ")
+
+            {Get-StateOfTicTacToe -Board $grid} | Should -Throw "*Impossible board: game should have ended after the game was won*"
+        }
+
+        It "Invalid board: X kept playing after O wins" {
+            $grid = @( "XX ",
+                       "OOO",
+                       " XX")
+
+            {Get-StateOfTicTacToe -Board $grid} | Should -Throw "*Impossible board: game should have ended after the game was won*"
+        }
     }
 }
diff --git a/exercises/practice/swift-scheduling/.meta/tests.toml b/exercises/practice/swift-scheduling/.meta/tests.toml
index 7cc3e415..f2475c9e 100644
--- a/exercises/practice/swift-scheduling/.meta/tests.toml
+++ b/exercises/practice/swift-scheduling/.meta/tests.toml
@@ -56,3 +56,6 @@ description = "Q4 in the second quarter translates to the last workday of the fo
 
 [c920886c-44ad-4d34-a156-dc4176186581]
 description = "Q3 in the fourth quarter translates to the last workday of the third quarter of next year"
+
+[7c8f1616-be62-417e-bbd5-a60fa743eccc]
+description = "Q2 starting in the last month of the second quarter translates to the last workday of the second quarter of this year"
diff --git a/exercises/practice/swift-scheduling/SwiftScheduling.tests.ps1 b/exercises/practice/swift-scheduling/SwiftScheduling.tests.ps1
index 4d693938..b40d41ea 100644
--- a/exercises/practice/swift-scheduling/SwiftScheduling.tests.ps1
+++ b/exercises/practice/swift-scheduling/SwiftScheduling.tests.ps1
@@ -146,4 +146,13 @@ Describe "SwiftScheduling test cases" {
 
         $got | Should -BeExactly $want
     }
+
+    It "Q2 starting in the last month of the second quarter translates to the last workday of the second quarter of this year" {
+        $start = [Datetime]::New(2019, 6, 15, 9, 50, 0)
+
+        $got = Invoke-SwiftScheduling -MeetingStart $start -Description "Q2"
+        $want = [Datetime]::New(2019, 6, 28, 8, 0, 0)
+
+        $got | Should -BeExactly $want
+    }
 }
diff --git a/exercises/practice/tree-building/.meta/TreeBuilding.example.ps1 b/exercises/practice/tree-building/.meta/TreeBuilding.example.ps1
index cd85914c..286f9e41 100644
--- a/exercises/practice/tree-building/.meta/TreeBuilding.example.ps1
+++ b/exercises/practice/tree-building/.meta/TreeBuilding.example.ps1
@@ -54,6 +54,9 @@ Function Build-Tree() {
     | Sort-Object RecordId 
     | ForEach-Object {$nodes = @{}} {
         $_.Validate($upperBound)
+        if ($nodes.ContainsKey(($_.RecordId))) {
+            Throw "Record id is invalid or out of order."
+        }
         $nodes[$_.RecordId] = [Node]::new($_)
     }
 
diff --git a/exercises/practice/tree-building/.meta/tests.toml b/exercises/practice/tree-building/.meta/tests.toml
new file mode 100644
index 00000000..fcdc1d50
--- /dev/null
+++ b/exercises/practice/tree-building/.meta/tests.toml
@@ -0,0 +1,58 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[761790a3-4c27-461a-b4e9-8bce8ccee5a1]
+description = "empty list"
+
+[dcc89dc3-eb39-4f26-a3cd-964e607c95ff]
+description = "single record"
+
+[dcdb80f0-e5da-43e1-8b8d-6f307be89c0e]
+description = "three records in order"
+
+[2ff5b8f8-d95e-401e-9359-233919488d22]
+description = "three records in reverse order"
+
+[de798d3b-8905-4446-a114-a0dd2476d945]
+description = "more than two children"
+
+[13dd9b3c-6137-415f-b6fe-5044c1dfbc50]
+description = "binary tree"
+
+[5cfd29dc-166b-47da-84ca-1c60b5ae5941]
+description = "unbalanced tree"
+
+[a05ddb5d-2d11-4948-88d3-b5f18a44ddce]
+description = "one root node and has parent"
+
+[9ed09df2-8fd6-4e37-aa37-e7753c057a1a]
+description = "root node has parent"
+
+[8755a2c4-2c6b-4396-b155-b5bf4b6bc280]
+description = "no root node"
+
+[c6ef8f9a-4045-4949-a1e1-e0ae804e4af4]
+description = "duplicate node"
+
+[7a7b77a6-3447-4905-b79c-d22bfe43f408]
+description = "duplicate root"
+
+[c6f51bd7-3608-4390-b446-dfd1bcbf3ddc]
+description = "non-continuous"
+
+[1f3d1b50-4494-4b22-b88a-68f32f7d321d]
+description = "cycle directly"
+
+[ac568b50-3f9b-4cb4-b602-e0eb13de4269]
+description = "cycle indirectly"
+
+[cf954b21-3cef-420c-8e72-d19547505e1f]
+description = "higher id parent of lower id"
diff --git a/exercises/practice/tree-building/TreeBuilding.tests.ps1 b/exercises/practice/tree-building/TreeBuilding.tests.ps1
index 293a0930..26927238 100644
--- a/exercises/practice/tree-building/TreeBuilding.tests.ps1
+++ b/exercises/practice/tree-building/TreeBuilding.tests.ps1
@@ -23,14 +23,14 @@ BeforeAll {
 
 Describe "TreeBuilding test cases" {
     Context "Valid records input" {
-        It "empty list input" {
+        It "empty list" {
             $records = @()
             $tree = Build-Tree -Records $records
     
             $tree | Should -BeNullOrEmpty
         }
     
-        It "one Node" {
+        It "single record" {
             $records = @(
                 [Record]::new(0, 0)
             )
@@ -39,7 +39,7 @@ Describe "TreeBuilding test cases" {
             NodeIsLeaf -Node $tree -NodeID 0
         }
     
-        It "three Nodes in order" {
+        It "three records in order" {
             $records = @(
                 [Record]::new(0, 0)
                 [Record]::new(1, 0)
@@ -52,7 +52,7 @@ Describe "TreeBuilding test cases" {
             NodeIsLeaf -Node $tree.Children[1] -NodeID 2
         }
     
-        It "three Nodes in reverse order" {
+        It "three records in reverse order" {
             $records = @(
                 [Record]::new(2, 0)
                 [Record]::new(1, 0)
@@ -101,7 +101,7 @@ Describe "TreeBuilding test cases" {
             NodeIsLeaf -Node $tree.Children[1].Children[1] -NodeID 6
         }
     
-        It "unbalanced treed" {
+        It "unbalanced tree" {
             $records = @(
                 [Record]::new(5, 2)
                 [Record]::new(2, 0)
@@ -124,6 +124,14 @@ Describe "TreeBuilding test cases" {
     }
     
     Context "Invalid records input" {
+        It "one root node and has parent" {
+            $records = @(
+                [Record]::new(0, 1)
+            )
+    
+            {Build-Tree -Records $records} | Should -Throw "*Node record id should be greater than parent id.*"
+        }
+
         It "root Node has parent" {
             $records = @(
                 [Record]::new(0, 1)
@@ -141,6 +149,25 @@ Describe "TreeBuilding test cases" {
     
             {Build-Tree -Records $records} | Should -Throw "*Record id is invalid or out of order.*"
         }
+
+        It "duplicate node" {
+            $records = @(
+                [Record]::new(0, 0)
+                [Record]::new(1, 0)
+                [Record]::new(1, 0)
+            )
+    
+            {Build-Tree -Records $records} | Should -Throw "*Record id is invalid or out of order.*"
+        }
+
+        It "duplicate root" {
+            $records = @(
+                [Record]::new(0, 0)
+                [Record]::new(0, 0)
+            )
+    
+            {Build-Tree -Records $records} | Should -Throw "*Record id is invalid or out of order.*"
+        }
     
         It "non continuous" {
             $records = @(