A 3-player trick-taking game with a must-follow trump card, but there's a 4th player (a robot: 'Robo' in play).

Suits are 1 to 13 in 4 colors. Robo will play cards according to their program, so it depends on their program whether to play small and large number cards when following suit.

You can win up to 3 tricks out of 12 tricks, but if you win 4 tricks or more, you lose points.