Binairo

Medium Binairo uses an 8×8 grid with 64 cells. Every puzzle at this level requires at least one T2 deduction: a one-step look-ahead where you temporarily assume a cell holds one value, find a local contradiction, and conclude it must be the other. T1 alone (consecutive forcing and counting) is not sufficient.

When consecutive forcing and counting stall, try the sandwich pattern: a 0-?-0 configuration forces the middle cell to 1. If that still leaves gaps, assume a cell is 0 and propagate — if a triple forms or a count is violated, the cell must be 1. This look-ahead usually resolves the stuck cell immediately.

Ready for larger grids? Try hard.