30-ball bingo
30-Ball Bingo Marker
Tap to dab your 3x3 speed bingo card while you play online or in person. Marks are saved locally on refresh and every card carries a timestamped integrity badge.
Your live card
Generated 6/12/2026, 3:59:34 AM
Card ID: 84c22917-6de9-4bb5-aea7-0f9252235282
Integrity: verified
Checksum 302e1140
New card ready to play.
Marked numbers
0 / 9Nothing marked yet. Tap a square or type a number.
Saved state & integrity
Everything lives in your browser: card numbers, marks, timestamps, and a checksum. If the checksum ever disagrees with the saved data, we flag it here—handy for keeping play honest without a backend.
- Created
- 6/12/2026, 3:59:34 AM
- Last saved
- 6/12/2026, 3:59:34 AM
- Checksum
- 302e1140
- Snapshot
- 84c22917 • 6/12/2026, 3:59:34 AM • checksum 302e1140
Bring your own numbers
Enter 9 unique numbers between 1 and 30, separated by commas or spaces.
We validate uniqueness & range 1–30.
How the integrity badge works
- Every card stores a timestamp, card ID, your marks, and a checksum in local storage.
- The checksum is recalculated on load; if it doesn’t match, we flag it so everyone knows to reset.
- No account or server required—perfect for honor-system games where you still want a paper trail.
- Need to switch devices? Copy the snapshot text and paste it into a note for reference.