Each step survives with probability 1/2. Payout at step k = 0.97 × 2^k: the game returns 97% at every banking point.

The side bet has its own stake, chosen by you: will you stand on step 3, 5 or 7? It is won the moment you land on that step and paid on top of your bank (also if you fall later). Bank or fall before that step and the side stake is lost.

The whole bridge is drawn before the round starts: the breaking pane of every step (the pane map), from HMAC-SHA256(serverSeed, clientSeed:nonce). The server seed hash commits to it; the seed is revealed when the round ends. The side bet is settled on that same map by your own walk, with no separate draw.

Demo note: this demo runs the engine locally in your browser as a stand-in for the round API. In production the seed lives on the distributor RGS and the client never sees it before the round ends.