Cute, addicting, and chemical! I heard myself explain aloud to my 6 year old, who was playing the game, about repulsion and attraction of subatomic particles. I love it :-)
Awesome Great way to learn how atoms work
Amazing physics, and pretty fun, too!
Great game How do I build my own levels?
Dr phyiscs is here This is a very cool and educational game.
Very cool combined physics demo and puzzle game Ignore the cheesy humour and somewhat inconsistent difficulty; this is very cool. The physics is deeper than it first appears and the puzzles are really quite engrossing. The linked web page gives lots of background info on the science. Only problem is that it's too short, but more is promised. Bonus credit for zero unnecessary permissions.
-More levels, more science
-Now with Oxygen atoms!
-New, realistic Scanning Tunneling Microscopes