We have them all on the one frame, and we paint the rams red, then the other critters green, blue and black as they get smaller.
This makes a snooker shoot.
Ten shots in two minutes, you have to hit a red to earn the right to go for a colour. Scores as in snooker, 1,3,5, and 7. Maximum possible is 40 (5 reds and 5 blacks). Miss a red, too bad, next shot has to be try a red again.