code faster
or lose.
AlgoArena is a real-time competitive coding combat platform. Match up. Solve. Climb. No tutorials, no hand-holding — just you, an opponent, and a problem on the clock.
# match started at 14:32:01 EST def two_sum(nums, target): seen = {} for i, n in enumerate(nums): comp = target - n if comp in seen: return [seen[comp], i] seen[n] = i return [] # > submit ───────────────────── # [✓] case 01 passed ( 2ms ) # [✓] case 02 passed ( 3ms ) # [✓] hidden passed ( 4ms ) # > ACCEPTED — +250 pts # > opponent forfeit. you win.
three weapons.
one objective.
Every match is a stress test of speed, accuracy, and nerve. AlgoArena gives you the tooling — winning is on you.
real-time battles
Sub-100ms socket sync. Watch your opponent's score tick live as you race to the next problem. No pauses, no rematches — first to finish wins.
multi-language
Python, JavaScript, and Java — switch mid-match if you want to. Sandboxed runtime, full stdlib, output capture, hidden test cases under the hood.
rank progression
Bronze through Diamond. Five tiers, fifteen divisions. Earn points per win, lose them on defeat, and watch your badge mutate as you climb.
how it works.
Create or join a match.
Spin up a 1v1, 2v2, or free-for-all lobby. Or browse the open queue and drop in. Choose your time limit. Wait for ready.
Solve faster than your opponent.
Problems unlock simultaneously. Submit in any supported language. Hidden tests grade in real time. Every accepted solution scores points for your team.
Climb the leaderboard.
Win to rank up. Lose to fall off. Reach Diamond, defend Diamond, or rage-quit and start over — your call. The leaderboard remembers everything.