CABO

Start with 4 hidden cards and remember 2. On your turn draw and replace, discard, use an ability, or call CABO. 7–8 peek at your own card; 9–10 spy; 11–12 swap without looking. A discard-pile card must replace cards and stays faceup; no ability. Exchange matching cards together. A failed match exposes the selected cards and adds the drawn card; selecting 3 or more also adds a hidden penalty card. Calling CABO gives everyone else one last turn. An empty deck also ends the round. A lowest or tied-lowest caller scores 0; a failed caller adds 10; everyone else scores their hand. Exactly two 12s and two 13s score 0 and give everyone else 50. Exceed the room limit to end; lowest total wins, ties compare the last round. In 100-point games, exactly 100 resets to 50 once. Quick 50-point games have no reset.

Rooms expire 24 hours after the last action. Invitations contain no password; share it separately.