Rocketman

A provably fair crash game with a space theme. Rocket flies -- multiplier grows. Cash out before it explodes. Three modes with different volatility and jackpots. Built solo as a side project alongside Depo44.

GameCrashiGamingBuilt in public

Status: In development | Current: Iteration 3 done -- animated game loop live | Next: Iteration 4 -- single-player with Supabase

Iteration 3 -- Animated game loop

Live multiplier, cash out button, 5-phase state machine, auto-restart with 5s countdown.

Open demo

Math simulator

Runs crash rounds in the browser to verify that RTP and operator margin converge to target values. Set a bet amount to see results in dollars alongside percentages.

House edge

4.0%

Target RTP

96.0%

Max payout

×10

Jackpot

×10

Bet per round:

Players per round:

Rounds:

Session: 10 players × 100 rounds = 1,000 betting events

Game modes

Each mode has a hard payout cap -- the jackpot multiplier is the ceiling. If the rocket reaches it, the round ends and all active bets win at that multiplier.

Orbit×10

RTP 96.0% | House edge 4.0%

Standard mode. Lower risk, frequent crashes, entry-level bets.

Moon×50

RTP 97.0% | House edge 3.0%

Higher volatility. Rare big wins. For players who want more.

Mars×100

RTP 98.0% | House edge 2.0%

Maximum volatility. Capped at ×100. High minimum bet. Few reach it.

Roadmap

Iteration 0Project page live

Done

Iteration 1Math simulator -- RNG, RTP, crash distribution

Done

Iteration 2Visual UI -- static prototype, SVG curve, space theme

Done

Iteration 3Animated demo -- live multiplier, cash out button, auto-restart

Done

Iteration 4Single-player -- Supabase, virtual balance

Iteration 5Multiplayer prototype -- Supabase Realtime

Iteration 6Developer handoff -- production architecture

Changelog

v0.52026-05-04

Animated game loop -- Iteration 3

Full game animation at /sandbox/rocketman/demo. 5-phase state machine: idle → countdown (5 s RAF timer) → flying → cashed_out | crashed → countdown loop. Multiplier grows at e^(t × ln(10)/10000) -- reaches ×10 in exactly 10 seconds. Crash RNG: 1/(1−u) capped at ×10, 4% instant-crash probability. RAF-based animation with stale-closure prevention via useRef. Visual phase feedback: blue curve (flying), green (cashed out), red (crashed). Rocket emoji → 💥 on crash. Bottom control bar adapts to each phase. Auto-restart: 1.8 s delay after crash, 2 s after cash out, then 5 s countdown.

v0.42026-05-04

Visual prototype -- Orbit mode

Iteration 2: static visual mockup of the Orbit game screen at /sandbox/rocketman/demo. SVG canvas (720×420) with space theme: dark background, star field, exponential multiplier curve (10^(t/10)) with gradient fill and glow stroke. Rocket emoji at curve tip, large 4.20× multiplier display. Left panel with mock player list (User/Bet/Win). Bottom controls: current bet, live win amount, CASH OUT button. No animation yet -- pure static snapshot at ×4.20.

v0.32026-05-04

Math fixes + session model

Fixed RNG formula bug: replaced (1−h)/(1−u) with 1/(1−u) -- crash points are now always ≥ 1×, instant crash rate correctly converges to house edge. Fixed operator earnings: switched from empirical "ride-to-crash" calculation (which showed operator losing money) to correct theoretical values (N × bet × houseEdge). Replaced "Simulation size" selector with "Players per round" (1/10/100/1000) and "Rounds" (1/10/100/1000) -- simulator now models a real session. Removed redundant "Operator edge/round" column, replaced with "Operator / 1K rounds" showing dollar earnings per 1,000 rounds. Hard payout caps confirmed for all modes: Orbit ×10, Moon ×50, Mars ×100. UI: aligned card heights across rows, added section titles, removed container background.

v0.22026-05-04

Bet amount + operator earnings

Added bet amount selector (5¢, 10¢, 50¢, $1, custom input). Crash distribution histogram now shows dollar returns per bucket. New Operator Earnings block: total wagered, paid out to players, operator profit, profit per round.

v0.12026-05-04

Math simulator

Interactive crash simulator with three modes (Orbit/Moon/Mars). Runs up to 1M rounds in browser using inverse-transform sampling. Verifies RTP convergence and shows crash distribution histogram.

v0.02026-05-04

Project started

Iteration 0 -- project page live on bildery.com/sandbox/rocketman.

Rocketman -- Crash Game | Side project by Yevhenii Holovei | Built in public alongside Depo44