Algodoo

It is a calculator that uses the binary number system, (only 0's and 1's). It can add subtract and count. All the controls are in the scene. I've made it more user friendly and fixed the noughty little spelling error.
It still has some bugs, but works fine enough.
PS. If you don't like it becouse you don't understand the binary number system, don't rate.

I will try to teach some of you how the binary number system works:
1=1
01=2
11=3
001=4
101=5
011=6
111=7
0001=8
1001=9
0-
101=10
1101=11
0011=12
1011=13
0111=14
1111=15
and so on

The binary number for 13 (1011) stand for:
1-1
0-2
1-4
1-8
wich means 1+4+8=13

If you still don't get it, then google it or something.

edit: I've removed some things to make it a little less laggy, nad I've changed some gates so it would fail less.