Nice arcade game with quite a bit of
science behind it.
Maxwell's Demon has been around
when our Universe was born,
and will still be there at the
very end of everything, till he
finishes his arduous labor of resisting the Great Law of
Creation - The Law of Growing Chaos.
Demon's job is to sort out the atoms of different
kind into separate compartments. You could help him by
sliding the walls with your mouse.

Maxwells Demon is the Shareware version. The full version can be purchased by clicking on the "CLICK HERE TO ORDER" button below for around 12.50USD.