Hello Codeforces!

Are you tired of only doing virtual contests? Want a more fun way to compete with friends, alone or on a team? Try Bingo-CP.

What is Bingo-CP?

Bingo-CP is a free web app that turns Codeforces practice into a quick social game. Problems are placed on an n×n bingo board. Teams of 1–4 players compete at the same time. The first team to complete any row, column, or diagonal wins.

Try it: https://bingo-cp.vercel.app/home

How to play

1. Click "Create Match" as in the picture.

2. Choose grid size (3×3 to 6×6), start time, duration, rating range, and mode.

3. Add team members by Codeforces handle (1–4 each).

4. Start the match. All teams solve at once. The first accepted submission claims the square for the team.

5. First team to complete a row, column, or diagonal wins.

Solves are detected automatically from Codeforces submissions, so no one needs to claim squares manually.

Match options

Start time and duration.

Rating range for problem selection.

Mode: Classic (fixed board) or Replace.

Replace mode: when a square is solved it is replaced by a new problem that is tougher. The replacement’s rating is the solved problem’s rating plus the Replace increment.

Example: a solved 1400 with increment 100 will be replaced by a 1500 problem. Replace mode keeps the board getting harder as the match goes on and encourages different team strategies.

Grid size: 3×3 to 6×6.

Team handles: enter Codeforces handles for each team.

Modes

ICPC mode

This is the main mode right now. You can play Classic or Replace.

IOI mode

Planned, but currently disabled because of API issues. I’m working on a fix.

Press it to start your match.

Winning team and final stats.

Help & FAQ

I answered common questions (problem selection, Replace mode, scoring, API limits, and more) on the Help page. Please check it first: https://bingo-cp.vercel.app/help

If you have ideas or find bugs, please comment here or contact me privately.

Thanks for reading, and hope you enjoy it!