I’m not creative so
Here's a bunch of topics on them
The ULTIMATE Guide to puzzles in GKC
Puzzles for your game
Puzzles for my Map
Puzzles for my game "Alive"
Puzzle Ideas Both Complicated and Simple
Ideas for a puzzle
Need ideas for a puzzle game
Puzzle Suggestions
I need ideas for puzzles and mini bosses
Maybe you could look through a couple topics and get some ideas.