Picross (nonograms) turns logic into pictures. The numbers beside each row and column tell you the lengths of its filled runs; deduce which cells are filled and a little pixel drawing appears.
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No guessing, guaranteed
Every puzzle is generated fresh and solvable by pure logic: if you're ever tempted to guess, there is always a cell you can deduce instead. That guarantee is the difference between a logic puzzle and a coin flip.
Marking cells
Arrows move, ENTER fills a cell, and 2nd marks an X for cells you've proven blank. The X marks are how you make progress visible: most deductions come from what can't be filled.
Sizes
Boards come in 5×5, 8×8, and 10×10. Fives are warm-ups, tens are proper puzzles with layered row-column reasoning. The calculator keeps your best solve time for each size.