The principle of the game is very simple: to win the displayed card, you have to discover the missing or duplicate color of the illustrated rainbow.
Beforehand, we install the 7 color cards of the rainbow in a circle. In the center, we put the "zero-duo" card there: when the "zero" side is exposed, you have to find the MISSING color of the rainbow. And if the card is on the "duo" side, it will find the color that is present TWICE.
Let's go! We reveal the first card of the draw pile and, following the "zero-duo" card, we tap on the desired color card. The fastest player pockets the rainbow card put into play.
When the draw pile is exhausted, it is of course the player who has won the most who wins the game.