The puzzle is to figure out the rules for several variants of minesweeper. Not particularly difficult, but the variants are pretty fun to play.
Don't read any more here if you want to figure it out for yourself:
Standard: standard minesweeper.
Zeroes: standard rules, but clicking on a zero square does not automatically open up the squares around it. All of the following variants include this rule.
Spider: the mines move randomly after every click. They only move horizontally and vertically, and if you click on a square that isn't a mine, it becomes a block for the mines.
Symbol: uses symbols instead of numbers. The symbols change every game, so you can't memorize them from previous games. I just clicked around randomly about 10 times, then I hoped that one of the symbols was a zero and started clicking all around it. After 5-10 tries, this succeeded and I won a game.
Memory: revealed squares are only visible while your mouse is over the square.
Knight: numbers show number of mines that are chess knight's move away from the square.

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