Posting Puzzle
mametter.itch.io- Category
- Entertainment
- Rank
- No. 275Apps board
Previous survey · No. 265 ·
- Pricing
- Free
- Type
- GAME
- Date
About
Posting Puzzle is a browser puzzle game in which players sort envelopes and stamps into matching pairs, built as a playable illustration of Post's Correspondence Problem. It includes twelve stages: six solvable by hand and six harder instances drawn from research, including one tied to the recent resolution of PCP[3,4].
At a glance
Posting Puzzle turns a math problem into a mail-sorting game. Each tray adds a sequence to both rows, and the challenge is to make the two sequences match. It is worth a short visit if you enjoy finding rules by experimenting.
Good fit
Logic-puzzle players and computing teachers looking for a concrete way to introduce Post’s Correspondence Problem.
Consider something else when
Skip it if you want a long campaign of puzzles at a steady difficulty. The creator designed only the first six for solving by hand.
Start here
Start on the first stage and press 1, 2 or 3 to push a tray. Use Z or Backspace to undo a move and try a different order.
Cost and requirements
The creator lists it as a free HTML5 game on itch.io. The documented controls use a keyboard.
Limits to know
The last six stages are research examples. The rules and controls were reviewed from the creator’s page.
Sources checked 2026-11-05. Source-based assessment.
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