Chessku is a daily deduction puzzle that crosses chess with Wordle. Every square on a grid shows a number — the mobility of an unseen chess piece. Your job is to work out which piece sits where, using Wordle-style coloured feedback to narrow down the answer guess by guess.
If Chedoku is chess meets Sudoku, Chessku is chess meets Wordle.
No grand origin story here. The idea just appeared one day: a Wordle-style puzzle where you guess chess pieces from their mobility numbers. It started as a single HTML file to see if the mechanic worked. It did. The rest is just making it nice enough to share.
Chessku No. 0001 launched on 11 April 2026.
A new puzzle appears every day at midnight in your local timezone. The same puzzle is shared by every player worldwide — your seed is derived from the calendar date. Five modes (Easy through Insane) all share the same daily seed, so each mode produces a distinct board.
After solving, hit Share to copy a spoiler-free emoji grid to your clipboard — paste it into a group chat and see how your friends compare.