SF Labs

Original slots, built on proven math.

We design, simulate and ship our own video slots: one server-side engine per game, PAR sheets from billions of simulated rounds, and documentation ready for a test lab.

The Slim Panter Starforge
The Slim Panter: a panther in a tuxedo holding up a diamond

Heist caper slot · New

The Slim Panter

A gentleman thief works the Monaco gallery. Panter Wilds expand with multipliers, Mystery Dossiers reveal matching symbols, and the Grand Heist climbs from the gallery to the Diamond Train to the Royal Vault at ×10.

Play the demo Play money only · 18+
Grid
5×4, 20 lines
RTP
96.50%variants 95.50 · 94.50 · 92.00
Volatility
Very high
Max win
10,000×
Free spins
1 in 1971 in 120 with Caper Boost
Feature buys
100× · 200×

  • Expanding Panter Wilds

    Wilds on reels 2–5 grow to fill the reel and carry ×1 to ×10. Several wilds on one line add their multipliers together.

  • Mystery Dossiers

    Every dossier on the screen opens at once into the same paying symbol. In the Master Heist they only reveal high symbols.

  • The Grand Heist

    Each wild in free spins adds a Clue Paw. Four unlock the Diamond Train at ×3, eight open the Royal Vault at ×10, each with 4 extra spins.

The heist intro that opens free spins
Royal Vault stage at ×10 with two expanded wilds Diamond Train stage at ×3 An expanding Panter Wild completing a line Stage 3 unlocked: Royal Bullion Vault The Grand Heist and Master Heist feature buys

Cosmic gem slot · Stake exclusive

Starforge

Pays anywhere on a 6×5 grid. Tumbles chain wins together, Star Orbs worth up to 500× multiply them, and the number of Forge Cores decides how hot the free spins run.

Grid
6×5, pays anywhere
RTP
96.50%variants 95.50 · 94.50 · 92.00
Volatility
Very high
Max win
10,000×
Free spins
1 in 2591 in 147 with Forge Boost
Feature buys
100× · 200×

  • Tumbles

    Every win clears its symbols and new ones drop in. The chain runs until nothing pays.

  • Star Orbs

    Multipliers from 2× to 500×. In the base game they add up and multiply the whole tumble sequence.

  • Three Forge tiers

    4, 5 or 6 Forge Cores open Molten, Plasma or Platinum free spins: 10, 15 or 20 spins, with the Forge Multiplier pre-charged at ×5 or ×10.

  • A multiplier that only climbs

    In free spins every winning Star Orb is added to the Forge Multiplier, which never drops until the feature ends.

Plasma Forge free spins with the Forge Multiplier at ×40 A free-spins win lit up with Star Orbs A base-game tumble paying out The Starforge base game Bonus Buy and Super Bonus Buy

How we build

The math comes first.

  • 01

    One engine

    Each game has a single math engine shared by the game server and the simulator. The client only shows results; it never decides them.

  • 02

    Simulated, not guessed

    RTP, hit rate, volatility and win distribution come from PAR sheets. Starforge's base game alone was run for 2 billion rounds.

  • 03

    RTP variants

    Every title ships tuned at 96.50%, 95.50%, 94.50% and 92.00%, each with its own PAR sheet.

  • 04

    Ready for the lab

    Game rules, a math overview, PAR sheets and a provably fair mode come with every game. Each PAR sheet is tied to the exact engine code by a fingerprint.