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Hard
Binary #631 · 10×10
Your game is saved in this browser as you play.Rules of Binary
- 10×10grid
- 20given cells
- 80to fill
- 20% given
Binary #631 is a 10×10 grid at hard level. 20 of its 100 cells are given, about 20 %, and the other 80 follow from the three rules.
The givens already show 6 pairs of equal symbols side by side. Close each pair with the opposite symbol at both ends: that is the quickest start.
There are 3 gaps between two equal givens. Each takes the opposite symbol.
Hard grids need the endgame rules: work out the ways a nearly full line can end, and remember that no two lines may be identical.