Binairo

Einstein Binairo is the hardest level: a 14×14 grid with 196 cells. Seven 0s and seven 1s per row and column. Every puzzle at this level is certified solvable through constraint propagation alone — no trial-and-error or backtracking needed.

That certification means every step forward can be deduced from the current state using consecutive forcing, count completion, and uniqueness elimination. If you find yourself guessing, step back and look for a constraint you missed. The solution path exists, and it is purely logical.