Sum 61

Sum 61 is a fast-paced math strategy card game built around reaching 61 before anyone else does.

Play cards, plan your moves, and outthink your opponent in short tactical matches. Sum 61 blends mental math, card timing, and puzzle-like decision making into a clean competitive game.

Features:
- Fast number-based card battles
- Online rooms with shareable room codes
- Solo puzzles and practice modes
- Leaderboards and profile progression
- Customization unlocks
- Simple rules with strategic depth

Sum 61 is free to play. In-app purchases may be available for optional cosmetic items or memberships and do not provide cash rewards, NFTs, cryptocurrency, gambling, or real-money prizes.