This is not obvious from the FAQ. Are (logic) puzzle games on-topic?
Although some logic puzzles are made on paper, most of them are available as computer games (even the ones that are also made on paper).
So, for instance, Lights Out was on-topic (but some people thought it should have gone to other sites). Although someone can make this puzzle work on paper, usually it's implemented in an electronic device.
But Sudoku was closed as off-topic. And there are tons of implementations of Sudoku on computers and even mobile phones.
So... Are puzzle games on-topic? Or some of them might be on-topic while others are off-topic? If that happens, what would be the criteria for classifying such game as on or off-topic?