Binairo

Expert Binairo uses a 12×12 grid with 144 cells. Six 0s and six 1s per row and column, 12 rows that must all remain distinct. These puzzles require T3 heavily: uniqueness deductions fire repeatedly throughout the solve, not just once.

Pencil marks (notes mode) become essential at this level. After applying consecutive forcing and counting, you will frequently need to compare multiple pairs of partially-filled rows and columns for near-duplicates. Each uniqueness deduction typically opens a cascade of further deductions.

Patience and systematic row-by-row scanning separate successful solvers from those who feel stuck. No guessing is ever needed — if you are bifurcating, there is a T3 deduction nearby that you have missed.