About

About Shikaku

Shikaku is a browser-based rectangle puzzle studio built around one idea: make logic puzzle play feel clear, focused, and easy to return to. The site brings together fast practice boards, official daily challenges, streak-based play, archive browsing, sharing tools, and a dedicated solver in one lightweight experience.

We design the product around readable interfaces, short learning curves, and puzzle flows that stay understandable even as the feature set grows. That means giving new players a smooth starting point, while also adding enough depth for regular players who want archives, comparison tools, and custom challenge workflows.

What You Can Do Here

You can use Practice to warm up on different board sizes, play the Daily Challenge for official rotating boards, review past sets in the Daily Archive, create or share challenge links, and use the Solver to test custom clue layouts or verify whether a board is solvable.

Product Direction

Shikaku is being developed as a living puzzle site rather than a single static game page. We expect the modes, archive tools, and public puzzle surfaces to keep improving over time, but the core goal stays the same: make rectangle puzzle solving feel approachable, fair, and satisfying on both desktop and mobile.