Tetris

It's a matter of some personal shame that we haven't had a proper Tetris game until now, but it's taken us this long to find a decent (and actually quite official-looking) version. And in case you've been frozen in a block of ice since about the 1960s, Tetris is the one where you arrange the falling bricks to fill in the gaps and make them disappear, and is a leading contender for the greatest computer game of all time.

This version has everything you'd expect, right down to the tinny electronic music, with the possible exception of a slighly oversensitive "drop" key and the addition of a new "deleting" brick which wipes out existing ones. Oh, and the option to activate some differently shaped "special bricks" - some of which, in a gross violation of holy Tetris tradition - aren't even made out of 4 blocks at all. Blasphemy!

Left and right arrow keys to move block, up arrow to rotate, down arrow to drop.

Usual Tetris tactics apply (if you must leave a gap, don't build up a big pile of blocks directly above it), but the "deleting" block changes this a little as you can sweep it from side to side to wipe out a whole row in one go.