Binairo
Medium00:00
Classic12
10
12
13
30
23
11
21
0·1
4·2
1·2
1·1
2·2
3·1
0·1
1·2
About medium Binairo
Medium Binairo uses an 8×8 grid, increasing the cells to 64 and the target count to four 0s and four 1s per row and column. The larger grid means consecutive forcing alone is not always enough — you need to combine it with counting and sandwich patterns.
Watch for sandwich patterns: if cells A and C both hold 0 with an empty cell B between them (0-?-0), cell B must be 1. When a row has three of one digit and several empty cells, use the count constraint to eliminate candidates and look for forced placements.
Ready for larger grids? Try hard.