123doku : jeu de logique

Each puzzle poses a simple question: how much does each stone weigh?

Three values, sums to respect in each row and column, and one more rule: never two identical stones side by side. From there, everything else is deduced. No puzzle requires guesswork. Each one has only one solution, and it is reached through reasoning.

An Endless Progression
The puzzles follow one another in a single order, the same for all players. They increase in difficulty as you progress, with easier sections here and there. A solved puzzle disappears permanently. A failed puzzle remains playable until you solve it.

The Puzzle of the Day
Each day, a puzzle slightly above your level, outside of your progress. Stuck? Switch to guided mode, step by step, without losing anything.




Daily Groups

You're matched with players of your skill level every day. Solve puzzles, earn points, and compare your score to the midnight rulebook.




When You Get Stuck

Four hints are available: reveal a stone, point out an error, check an incomplete puzzle, or ask for advice explaining the rule to apply. You're never truly stuck. At worst, you just wait.



A pencil with nine hypotheses per square to jot down your deductions. Six languages. Five visual themes. No account creation required.