OrderInference

Make space for a little focused thinking with a quiet, offline number-logic game.

Choose a 6×6 or 9×9 board and work through rows, columns, and boxes at your own pace. Three chapters—Beginner, Intermediate, and Expert—offer 20 puzzles each, with a gradual shift from generous clues to deeper constraint combinations. Every generated puzzle is checked for a unique solution.

Learn the basics in an interactive 4×4 guided practice. During a puzzle, select a cell to enter an answer or switch to candidate mode to pencil in possibilities. Candidate notes never count as answers. Duplicate values are marked in their shared row, column, or box without revealing the solution.

Undo or redo a move, clear a selected cell, or ask for one of up to three hints. Each hint places a verified value and explains how the row, column, and box constraints support it. A completed board is checked against the full puzzle, not just for filled cells.

Your active board, notes, timer, and undo history are saved on your device so you can return later. The date-based daily challenge works without a connection. Local statistics keep completion times, hint and undo counts, chapter progress, personal bests for each board size, and no-hint achievements.

Adjust the light or dark theme, tap sounds, motion effects, conflict markers, and candidate display to suit your preferences. No account or network connection is required to play. Game progress and preferences remain in local device storage.