About OpenDoku

What it is

OpenDoku is a family of free puzzle games. Each game starts with one easy rule, then offers harder versions of that same rule — a named climb from the easiest board to the summit.

No accounts, no ads, nothing to install. Your progress and records save on your own device, and every game keeps working offline once you've opened it.

The games

• 🏔️ SlopeDoku — winter brain games in Roman numerals, bunny slope to double black diamond, plus the Avalanche survival mode.
• 🌞 SurfDoku — the same climb at the beach, kiddie pool to double red flag, plus Riptide.
• ⛏️ MineDoku — mine the numbers that don't belong; every row and column adds to its target. Surface Dig to The Core, plus Lantern memory digs and Cave-In.

Every game explains itself on its own board, and the ⓘ button inside each game covers the full rules.

Who makes it

OpenDoku is built by Open Mirror LLC, a small family studio in St. Louis. New dokus start as ideas taken to StepInTheRing.com.