Like all the best Flash games, Switch is supremely easy to pick up, harder to master, and has a difficulty curve that makes it almost impossible to play (in a good way) after a few levels.

Moving your puck around the board, pick up the balls that are coloured the same as the puck. Then click the mouse to change your puck's colour and mop up the rest. You can switch colour at any time, but you'll get more points if you stay in one colour for longer (or play it safe and switch regularly).

If you want to cheat, take a look at the level codes.