How Bathtub Brawl works

A 30-duck battle royale where the tub drains from the edges in. Two minutes, one duck left floating, and a result anyone can replay.

A match, start to finish

30 seats per tub. Connect a wallet, press Jump in and sign a free message. No gas, no transaction.
Starts by itself. The moment the 30th duck sits down, the server rolls a random seed and the match begins.
Two minutes, hard cap. The match is always over by 2:00. Most end between 1:40 and 1:55 after a final duel.
The water drops 10 times, once every 12 seconds. The puddle shrinks toward the drain. From the second drop on, a duck on dry porcelain loses HP.
Every duck has 100 HP. Ducks slam, splash and crit each other. At 0 HP a duck sinks. Bubbles heal up to 21 HP, and a sponge halves the next two hits from other ducks.
Final duel. When two ducks are left, the feed calls it and they trade blows until one sinks.
You can close the tab. Your duck stays in the tub and plays on its own. The match is not a skill game: nothing you click changes it.

Tub types

Type	Who plays	Entry	Limits
FREE	Real wallets only	Free	20 joins a day per wallet
DEMO	Anyone, topped up by house ducks	Free	None. Never ranks bots

One wallet can sit in up to 5 open tubs at once, never twice in the same tub. A seat frees up the moment a match ends. Daily counters roll over at 00:00 UTC.

Fair by construction

The whole match comes from two inputs: the seed and the player list. Nothing else goes in.

When a tub fills, the server rolls 16 random bytes as the seed and immediately publishes sha256(seed) on the match page.
While the match plays, the server only sends events whose time has come. The ending cannot be read early.
When the match ends, the seed itself is revealed. Hash it and you get the commitment you saw at the start.
Players are sorted and then shuffled by the seed before anything happens, so seat number and join order change nothing.
The engine is /sim.js, the same file the server runs. The Verify page replays any match in your browser.

Names

You float as your short wallet address until you pick a duck name on Profile. Names are 3 to 15 characters, first come first served, and saved with a signed message.

History and leaderboard

Every finished match is written to a permanent ledger with its winner, commitment and seed. The leaderboard ranks real wallets by wins, then sinks, then top-3 finishes.