Satisfying simplicity.
Note: XXI is a logic-based number puzzle and does not involve card games or gambling mechanics. Just pure, clever math.
The Rules
Not gambling or cards
Despite the name, XXI is not a card game, nor is it gambling. It is a minimalist number puzzle played on a 4×4 grid of tiles. Your only goal is to find order in the numbers.
Make 21 exactly
Drag your path across the tiles to sum them up. You might find an easy 3-tile solution, or a clever 7–9 tile path that takes you the long way around. As long as it sums to 21, you win.
Progress and Share
Track your daily streaks and detailed stats. When you're done, generate a spoiler-free share card to show your friends the shape of your solution without giving away the path.
01
Scan the Grid
Look at the daily 4×4 number puzzle. Every day is a new challenge to find a path that sums to exactly 21.
02
Drag Your Path
Connect adjacent tiles to build your sum. Go for a quick 3-tile path or challenge yourself with long, clever 7–9 tile chains.
03
Share and Compete
Maintain your daily streak and share your results with spoiler-free cards. It’s pure logic, no gambling or cards involved.
