Since it's not the 90s any more, I don't know if it's still time for Klax, but I still enjoy it on occasion. You have a bin and have to sort colored tiles into it in such a way that three or more of the same color line up horizontally, vertically, or diagonally. You get bonuses for chain reactions and such, and for clearing more than three tiles at once.

The biggest clear, it would stand to reason, would be one that was diagonal from each corner and meeting in the middle, hence the 'Big X'.

It's actually kind of tough to set up one of these things, since you pretty much have to work on it from the beginning of a wave, and then not mess things up by getting a clear that collapses one side of the X, but it's worth lots of points if you can pull it off.

And once you get so far in the game, you'll have to create one to proceed anyway, so might as well get some practice in early.