4. Gameplay
Everyone plays simultaneously, building rainbows in sequence in the middle of the play area. On "Go" everyone flips through the cards in their hand one at a time, as quick as they can. When they flip over a card that can be played on a rainbow (more on that below), they have to act fast or someone else will beat them to it.
When a player has flipped through all of the cards in their hand, they pick up their pile of unplayed cards from the table and start flipping all over again. Everyone continues in this fashion until someone finally plays every card in their hand. This player is the WINNER.