What are your best homebrew puzzle?

Riddles/Puzzles
Tired of thinking of new traps and puzzles? Try out these...
D100 Puzzles & Mysteries
A fun open ended puzzle
Puzzle: 3 walls, 3 books (AKA the scribblenauts hallway)
Enter the Pungeon...
"Prank" encounters/traps a caster might add to their dungeon to...
Magic Maze Puzzle
The greatest weapon puzzle
Painting and turpentine puzzle
Endless staircase puzzle
First letter of number riddle
Seasons Room Puzzle
Puzzles/riddles in DnD
60 Dungeon Puzzles for you
Counting Riddle Puzzle
Knock knock riddle
The Fool's Riddle/The Red Herring Door
15 Simple Riddles to use in your campaign
100+ Dungeon Puzzles & Mysteries (Community made resource)
Simple yet effective puzzle: Two Chests and a Lie
Riddle for an animated book to give your party in a wizards dungeon
Best-received riddles you've used in an adventure?
Riddles you've used in an adventure?
Puzzle for getting through a forest that makes people magically lost?
Gate Guards Riddle
Lost Temple of the Monkey King. Traps, Tricks, and Dungeons, with a splash of excitement.