Support shikaku.ch
Shikaku.ch is free for everyone — no ads (yet), no subscription, no account. It's a small side project built and maintained by one person. If you enjoy the daily puzzle, any support means a lot.
Buy me a coffee
A small contribution keeps the site running and motivates future improvements — new features, more puzzle sizes, and keeping the daily puzzle going.
☕ Buy me a coffee
The Shikaku Puzzle Book
120 puzzles across four difficulty levels in a compact A5 softcover. Available on Amazon for €9 — another great way to support the project.
Get yours now →