4 ms·

Rows 3 and 5 are identical.

• tromp 12y ago
  This rule is easily overlooked in the tutorial, since the example shown can already be resolved using earlier rules (balancing red/blue in columns). The tutorial must use an example where unique rows/columns is the only way to resolve the choice...
• anon4 12y ago
  Oh, right. But what about the ones on row 1?
  • sp332 12y ago
    Well if you switch the squares on row 3, you have to switch the square on row 1 as well. Otherwise the columns will not have even numbers of red and blue squares.
    • anon4 12y ago
      Oh. It's really confusing to show not only the current mistake but also the mistakes that would be introduced by fixing it.
      • sp332 12y ago
        True. There is only a single solution to each puzzle, so it just highlights all the blocks which don't match the known solution.
  • deleted 12y ago
    [deleted]
• vlunkr 12y ago
  I guess I missed this rule. I got into a similar situation and thought there was a bug