A card is dealt, ace low through king. Call whether the next card is over or under it.
Call it right and you climb a rung — the ladder pays 1.30× more at every step.
Bank at any rung from 1 up. Call wrong and the round is over.
A tie is a push: the next card matches the one you were standing on. Neither over nor
under, so the round ends and pays the rung you were on — your stake back at rung 0. This is
roughly 1 call in 13, and it is not the app banking for you.
The top rung (⚑) cashes out automatically. A correct call from the rung below it ends
the round and pays the top multiplier — there is nowhere further to climb.
You must call at least one card before you can bank — that forced first call is where the
house edge lives.
Ranks are drawn uniformly with replacement, so every rung faces the same honest deck
and there is nothing to count. Suits are not modelled.
Fairness
The whole game is a value tree registered on HyperEVM. The contract ran backward induction
over it at registration: it cannot pay more than the pool reserved, and it cannot underpay
the sealed edge.
Optimal-play RTP is sealed at 97.9999% — a 2.00% edge, inside the protocol's
permissionless 1.5–2.5% band.
Randomness comes from the protocol beacon by commit–reveal; neither this page nor its
author can predict or pick a card.
Odds on the buttons are the committed widths from the registered tree — 13 ranks
don't divide 10 000 bps evenly, so those are the numbers money actually settles against,
not the ideal fractions.
Every rank is its own on-chain outcome, including the losing ones — so the card that beats
you is the card the chain settled, not one this page invented.