Your brain just picked a fight.
Ounie writes a trivia gauntlet from your notes — cited, competitive, free to play.
Open arenas
Live now — jump in.
Public arenas their owners listed for anyone to play. No account, just a name and twelve seconds a question.
Brain in. Arena out. Link shared.
Pick your brain(s)
Sign in with your Ounie account and your brains are just there — the notes, docs, links, and transcripts you already saved. Pick one or several, and Ounie writes a 10-question trivia set from what those pages actually say.
Cull the questions
Every question Ounie wrote shows the brain page it came from — a question that can't be traced to a page is dropped before you ever see it. Cut the weak ones, reorder the rest, and you settle only for what you publish.
Share the link — or stake a duel
Publish and anyone can play from the link — no account, name entry, 12-second questions, speed-weighted scores, a persistent leaderboard. Or challenge another brain to a duel and find out who knows whose world better.
Two ways to compete.
Beat my score
Generate an arena from your brain and post the link anywhere. Friends play logged-out — name entry, 12-second questions, speed-weighted scores — and chase you on a persistent leaderboard. One arena, unlimited free attempts.
Brain vs Brain duel
Two players each stake a brain — and each answers questions generated from the other's. Who knows the other's world better? Fighter cards built from real brain stats, health bars, combo streaks, a K.O., and a shareable result card.
Duels are opt-in per brain — accepting one means content from that brain becomes questions your opponent can see.
No hallucinated trivia.
Every question must trace to a page in the source brain — the ones that can't are dropped before you ever see them. And if a brain is too thin to make a playable set, the whole reserve refunds in full.
cited to brain page "pit strategy — undercut math"
Four stages. All free. Switch any time.
A skin is a token swap, not a regeneration — flipping it changes the whole arena instantly and never costs a credit.
Gold spotlights and a studio hush — the default stage.
Scanlines, pixels, and a cabinet glow from 1989.
Two-tone floodlights for the big-match feel.
Warm paper and lamplight for a quieter kind of duel.
The meter is on creation. Playing is free.
5 credits per arena · 1 credit per extra round pack · plays, leaderboards, skins and share cards are free. Credits are Ounie credits (1 credit = 1¢), shared with every Ounie product — no subscription here.
Your agent can build the arena.
Every arena is a REST endpoint and a native MCP tool. Point Claude, Cursor, or your Ounie AI Team at Brain Arena and it generates a cited, shareable trivia arena straight from your Ounie brains — drawing your shared Ounie credits, never overdrawing. One Ounie master key works across every Ounie app.
Generation is grounded in your own private brains, so agent access is API keys / MCP drawing your credits — there's no keyless pay-per-call.
// Connect from any MCP host (Claude, Cursor, the AI SDK)
{
"mcpServers": {
"brain-arena": {
"url": "https://arena.ounie.com/api/mcp",
"headers": { "Authorization": "Bearer ounie_live_…" }
}
}
}
// …or the Ounie AI Team — the key rides the URL:
// https://arena.ounie.com/api/mcp?api_key=ounie_live_…
// Tool call → create_arena
{ "brain_ids": ["…"], // ground + cite from your brain
"title": "F1 strategy gauntlet",
"skin": "gameshow" }
→ { "play_url": "https://arena.ounie.com/p/…",
"questions": 10, "grounded": true, "credits_spent": 5 }The questions we get first.
Publish your first arena in the next five minutes.
Your brain already did the studying. Now let it take challengers.