Binary 0/1 logic — free online or as a large-print book
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Fill every cell with 0 or 1: each row and column half 0s / half 1s, never three the same in a row, and all rows and columns different. Tap a cell, then tap 0 or 1.
How Binairo works
Binairo (also Takuzu or Binary Sudoku) uses only 0 and 1. Each row and column must have the same number of each digit, you may never place three identical digits in a row or column, and every row must differ from every other row (same for columns). Each puzzle has exactly one solution, reachable by pure logic.
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Prefer paper?
Large Print Binairo — 110 puzzles per volume (Easy to Hard), as a paperback (also in German).