Algodoo

UPD: Oh nutz! Looks like calculator needs battery replacement!
UPD2: Now with square root button

Yes, it's real !!!
Just start game and press calculator's buttons with mouse click.
I recommend to hide phun windows.

Very few people can really understand how hard it was to create such complicated device. I've spend a lot of time to make it works like real calculator. Sometimes I give up and think it's impossible , but again and again come back to it.

p.s. Accuracy of calculation is very strange, but it isn't my fault. Phun engine is very unpredictable one. For example 3.1 is always 3.099999 and I can't handle it

p.p.s Otacon - I hate you - your computer force me to fall into this!

UPD: Phun version 5.28 required!!! Scene uses immortal geometries (for keypress)