Algodoo

<markup>Many Algodooers often open camps with 30 or 40+ signups.
Although the bigger groups are funner, it's difficult to fill them up.
There are only 50 or so Algodooers (and me) that will join camps.
Not all of them will join yours so you will need to put the number lower.
Try to avoid going above 25 or below 12.
Here are some good numbers for camps:
<big>GOOD NUMBERS FOR CAMPS:</big>
12: 3 teams of 4 or 4 teams of 3
14: 2 teams of 7
15: 3 teams of 5
16: 2 teams of 8 or 4 teams of 4
18: 2 teams of 9 or 3 teams of 6
20: 2 teams of 20 or 4 teams of 5
21: 3 teams of 7
25: 5 teams of 5</markup>

Cool stuff from my testing world on the right