75-ball bingo
75-Ball Bingo Marker
Dab your classic 5x5 B-I-N-G-O card (with free center) from your phone or laptop. Saves progress locally and shows a checksum with timestamps.
Your live card
Generated 7/27/2026, 5:26:14 AM
Card ID: 571843b1-0bcc-4537-9469-975f9d22669c
Integrity: verified
Checksum 97a17fef
FREE
New card ready to play.
Marked numbers
0 / 24Nothing 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
- 7/27/2026, 5:26:14 AM
- Last saved
- 7/27/2026, 5:26:14 AM
- Checksum
- 97a17fef
- Snapshot
- 571843b1 • 7/27/2026, 5:26:14 AM • checksum 97a17fef
Bring your own numbers
Enter 24 unique numbers between 1 and 75.
We validate uniqueness & range 1–75.
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.