Futoshiki.
It's a logic puzzle in the same vein as Sudoku. Unfortunately, if you forget what it's called and try to find it by entering random parts of the word, you come up with some fairly obscene hits.
The main difference between Futoshiki and Sudoku is the addition of greater than/less than rules. Take this one, for example:
Fit the numbers 1-5 into the grid in such a way that no number is repeated in any row or column and the rules are followed. The box between the 5 and 4 could logically be either 2 or 3, but not 1. Simple enough, right?
Keeps me off the streets, at least...
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