A 7×7 cluster-pays, cascading slot from Spin Slaughter. Win, and the underworld rises.
Also live across Stake's platforms — stake.com · stake.us · stake.eu · stake.mx · staked.com
(global slug: spinslaughter-hades-spins)
Hades Spins takes the acclaimed Poseidon's Tide engine down into the underworld. It's a 7×7 cluster-pays slot with cascading / tumbling reels, and its signature mechanic is the rising underworld: as you win, molten lava floods the board from the bottom up, an obsidian-and-brass gauge climbs the rivers of the underworld — Gates → Styx → Acheron → Lethe → Cocytus → Phlegethon → Tartarus (record: Beyond Tartarus) — and multiplier badges are engulfed row by row. Lord Hades stands beside the board and drives the flood.
It's a social-casino title — play is in Stake Cash / Gold Coins (SC / GC), no real-money wagering.
| Grid | 7×7, cluster pays (5+ connected symbols) |
| Core mechanic | Cascading wins + the rising underworld (lava gauge → engulfing multiplier badges) |
| RTP | 96.5% (server-authoritative) |
| Max win | 5,000× |
| Bet modes | Base · Soul Surge (ante 1.25×) · River of Fire (buy 100×) · Wrath of Hades (buy 400×) |
| Free spins | "Underworld Rising" |
| Mascot | Lord Hades — scythe, ember crown (idle + reactive animations) |
| Currency | Social — SC / GC |
| Studio | Spin Slaughter |
Frontend — PixiJS v8 + pixi-svelte (Svelte 5 runes) + SvelteKit, an XState round machine, and Howler audio, on the Stake Engine web-sdk.
Math — Python engine on the Stake Engine math-sdk: server-authoritative books, forced-seed test suites, RTP-validated lookup tables (math shared with Poseidon's Tide, RTP unchanged).
frontend/ Stake Engine web-sdk app (apps/acqua-alta) + shared SDK packages — game source
math/ Stake Engine math-sdk game (games/acqua_alta) — math model source
assets/ cover art
Note: this repo holds source only. Built bundles,
node_modules, Python virtualenvs, and the generated math data (multi-GB book/lookup files) are intentionally excluded — the live game runs on Stake's RGS.