Gemdoku: Gem Logic Puzzle

One gem per row, column and colour - no two touching. Hundreds of levels, a shared daily challenge and a weekly leaderboard.

Gemdoku is a calm, clever logic puzzle. Place exactly one gem in every row, every column and every colour region - and no two gems may touch, not even diagonally. Every level has a single solution you can reach by pure deduction: no guessing, ever.

HOW IT PLAYS

• Tap a tile to mark an X, swipe to mark several, double-tap to place a gem.
• Boards grow from 4x4 to 10x10 as you progress, with a HARD level every 10 levels.
• Hints explain the exact deduction, so you learn the techniques as you go.
• Three lives per level. Lose them all and you can retry any time.

EVERY DAY

• A Daily Challenge shared by every player - see how many you beat.
• A daily streak with a reward chest every 7 days.
• A weekly leaderboard of real players.

MADE FOR SHORT BREAKS

• Levels save mid-way, so you can pick up where you left off.
• Sound, voice and haptics you can turn off.
• No account needed.

Gemdoku is a fresh take on the Queens / Star Battle family of puzzles, built for one-handed play.