In this game from the Microsoft Puzzle Collection, different coloured rats are running around a track. You can rearrange them by trapping and releasing them, and they can exit if you form them into particular hands. To begin with, these hands are three and four of a kind. New hands are introduced throughout the game - one is a rainbow of six different colours in the right order, which is difficult to arrange but will score lots of points. White rats are wild and can be used for any colour rat, but gray rats prevent other rats from exiting.