Rithmo

Rithmo brings back rithmomachia, the legendary "Philosophers' Game": a strategy duel born in 10th-century monasteries, where pieces are captured by the power of numbers.

Evens on one side, odds on the other. Every piece carries a number; to capture, line up an equality, a sum, a product… or trap your opponent in an arithmetic, geometric or harmonic progression. Easy to learn, dizzying to master: rithmomachia fascinated mathematicians and philosophers for seven centuries, and was long considered the great rival of chess.

PLAY YOUR WAY • Solo against the AI, two levels (800 and 1200) • Two players on the same device • Online with friends: turn-based games, get notified when it's your move • Blind matchmaking with Elo rating • One-tap rematch at the end of every game

LEARN AS YOU PLAY • Guided tutorial: eight progressive exercises to master every type of capture • Complete illustrated rules, available even mid-game • Visual move hints (can be turned off) • Simple mode to get started, expert mode to control everything: victory conditions, allowed captures

BUILT FOR MOBILE • Smooth 3D board, optional 2D view • Replay every move of a game at any time • Elo history and tracking of your ongoing games • English and French • No ads

Born a thousand years ago to teach Boethius's arithmetic, codified in print in the 16th century, rithmomachia deserved to live again. Now it fits in your pocket.

Your move.