12- i think this was the most kids we have had for a homeschool Looney for Learning game day! 12 plus a 4 yr old little girl that loves playing Martian Match Up with me.
The kids learned/played:
Volcano
Martian Backgammon
Martian Chess
Martian Coasters
Treehouse
Zendo
Aquarius
usually 2-3 kids per game. Martian Coasters had 4 though.