For the rainbow game, each pledge girl wears a different color lipstick, they choose pinks, reds, oranges, browns, blues, purple, black, etc.
The object of the game is to give the captive pledge-boy a rainbow colored dick.
Each pledge girl does her best to deep throat his hard cock, leaving a ring or color on the shaft.
The girl with the lowest ring gets a prize, a bunny rabbit vibrator.