diff --git a/subjects/tetris-optimizer/badexample00.md b/subjects/tetris-optimizer/badexample00.md
index ad5a09d1..df689771 100644
--- a/subjects/tetris-optimizer/badexample00.md
+++ b/subjects/tetris-optimizer/badexample00.md
@@ -1,4 +1,4 @@
-## bad example
+## bad example 00
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/badexample01.md b/subjects/tetris-optimizer/badexample01.md
index 5a242f76..d2cc43cc 100644
--- a/subjects/tetris-optimizer/badexample01.md
+++ b/subjects/tetris-optimizer/badexample01.md
@@ -1,4 +1,4 @@
-## bad example
+## bad example 01
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/badexample02.md b/subjects/tetris-optimizer/badexample02.md
index 06dd0e46..f0f583e0 100644
--- a/subjects/tetris-optimizer/badexample02.md
+++ b/subjects/tetris-optimizer/badexample02.md
@@ -1,4 +1,4 @@
-## bad example
+## bad example 02
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/badexample03.md b/subjects/tetris-optimizer/badexample03.md
index 5ba3cfb1..cdf4cf27 100644
--- a/subjects/tetris-optimizer/badexample03.md
+++ b/subjects/tetris-optimizer/badexample03.md
@@ -1,4 +1,4 @@
-## bad example
+## bad example 03
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/badexample04.md b/subjects/tetris-optimizer/badexample04.md
index 49c19cd9..b5469d51 100644
--- a/subjects/tetris-optimizer/badexample04.md
+++ b/subjects/tetris-optimizer/badexample04.md
@@ -1,4 +1,4 @@
-## bad example
+## bad example 04
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/goodexample00.md b/subjects/tetris-optimizer/goodexample00.md
index 14de9460..e962b6b9 100644
--- a/subjects/tetris-optimizer/goodexample00.md
+++ b/subjects/tetris-optimizer/goodexample00.md
@@ -1,4 +1,4 @@
-## good example
+## good example 00
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/goodexample01.md b/subjects/tetris-optimizer/goodexample01.md
index 6febbae1..db952e36 100644
--- a/subjects/tetris-optimizer/goodexample01.md
+++ b/subjects/tetris-optimizer/goodexample01.md
@@ -1,4 +1,4 @@
-## good example
+## good example 01
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/goodexample02.md b/subjects/tetris-optimizer/goodexample02.md
index 4b8d7784..1e5ffab8 100644
--- a/subjects/tetris-optimizer/goodexample02.md
+++ b/subjects/tetris-optimizer/goodexample02.md
@@ -1,4 +1,4 @@
-## good example
+## good example 02
 
 - Create your file and copy the example into it.
 
diff --git a/subjects/tetris-optimizer/goodexample03.md b/subjects/tetris-optimizer/goodexample03.md
index 48b6ea0d..de955d63 100644
--- a/subjects/tetris-optimizer/goodexample03.md
+++ b/subjects/tetris-optimizer/goodexample03.md
@@ -1,4 +1,4 @@
-## good example
+## good example 03
 
 - Create your file and copy the example into it.