Shikaku

Einstein Shikaku — what to expect

Einstein Shikaku is 15×15 — 225 cells with the widest factorization ambiguity. A clue of 30 could be 1×30, 2×15, 3×10, 5×6, or their rotations. Every puzzle is verified solvable through logic alone. Finding the path requires working through long constraint chains, but no guessing.