Cat in the Box

📦 Cat in the Box

Quantum trick-taking — the suit doesn't exist until you declare it.

Your name

or join one

Room code

How to play

Every card is black — it shows only a number. When you play it you declare a colour (🔴 red, 🔵 blue, 🟡 yellow, 🟢 green). The colour does not exist until you declare it.
You hold colour tokens. Declaring a colour spends one of that colour's tokens. Declaring anything other than the led colour also burns a token of the led colour — so following suit is cheap, cheating is not.
The research board holds one card per (colour, number) pair. A pair can only be claimed once per round — the board fills up, and legal declarations run out.
🔴 Red trumps. Otherwise the led colour beats the other two. Highest number within the winning colour takes the trick.
The player leading a trick cannot declare red until red has been declared that round — the trump can't be led straight away.
Before each round you predict how many tricks you'll win. An exact prediction earns a bonus equal to your longest chain of claimed board slots.
No legal declaration? Paradox — the round ends, you reveal your hand and lose a point per trick you won.
Most points wins.