21 Sum

Tap connected tiles that add up to 21 before the clock runs out.

iOS Android Free In-app Purchase

Coming Soon

What it Does

Find the 21

Tap connected tiles that add up to 21 and they vanish, with new ones dropping in and the clock reset. Bigger sums score far more, so a group making 42 or 63 beats two or three separate 21s — there is always a reason to look for the longer chain.

Set your own pace

Three board sizes from 6x6 to 10x10, and a clock you choose: Static holds steady, Continuous speeds up as your score climbs. A slower setting costs points, a faster one pays a bonus. Three lives, lost on a timeout.

A board everyone plays

The same daily challenge for every player, anywhere — share a link and a friend opens that exact board in their browser. Scores are replayed and verified on the server, so the top of the leaderboard is earned.

What it doesn't do
  • No ads. No purchases. No account. No network of any kind.
  • Nothing is collected — your results and preferences stay on your device.
Price
Free, with one optional in-app purchase. No subscription, no ads.
Requires
iOS 15.0 or later. iPhone. Android 10.0 or later.
Your data
Play as a guest with no account. The leaderboard stores the display name you choose and your scores; signing in with Apple or Google only keeps them across devices. No ads, no tracking, no analytics. You can delete your account and data from inside the app. Privacy policy
Support
Support and FAQ
Latest
v1.0 — Initial release
Next
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