14 × 14 is the largest Binairo grid we publish: 196 cells, seven 0s and seven 1s in every row and column, and no shortcuts. Every technique appears — pair capping, sandwich fills, quota counting, full-line completion analysis, and duplicate-row elimination — often chained together to crack a single stubborn cell.
Giant grids change how you scan. Working line by line beats hunting cell by cell: pick the most constrained row, exhaust it, and let each placement update the columns it crosses. On screens, the board scrolls sideways on phones — a tablet or desktop gives the most comfortable session.
These are marathon boards, so the timer is your friend only if you want it to be. Start with an easy 14 × 14 to acclimate before attempting the hard tier.