A Stake Engine glossary

The short version. A Stake Engine game is a set of pre-simulated rounds (books) weighted by a lookup table, played by a static front end through Engine's RGS. Here's every term you'll meet, in a line each.

Math

Book

One pre-simulated round: its ID, its ordered events and its payout multiplier.

Library

All the books from a simulation run.

Events (book events)

The ordered actions in a book, returned to the front end to animate. Anything not in the events can't be shown to the player.

Lookup table (LUT)

A CSV per mode with one row per book: simulation number, weight and payout. Weights set how often each round is picked.

Index file

index.json, which lists each mode's name, cost, books file and lookup table.

Bet mode

A playable option with its own cost, RTP, max win and files, such as a 1× base mode and a 100× bonus buy.

Cost multiplier

A mode's price as a multiple of the base bet.

Criteria, distributions and quotas

The math SDK's split of a mode into outcome classes (zero wins, base wins, features, win cap), each with a share of the simulations.

Win cap

A mode's maximum payout multiplier, its max win.

Force file

A record of which book IDs match which outcomes, for analysis and for finding specific rounds.

Optimization

Re-weighting the lookup table so a mode hits its RTP and hit-rate targets.

RTP

Return to player: a mode's expected payout divided by its cost. On Stake Engine, every mode must be between 96.0% and 96.7%.

Hit rate

The share of rounds that pay anything.

PAR sheet

A spreadsheet of a game's hit rates and RTP contributions, written by the math SDK's analysis step.

CVaR, ETL and tail probability

Risk measures of how bad the worst outcomes are for an operator. They set a game's bet limits.

Platform

Engine

Stake Engine's current name in its own docs and site.

Studio

Engine's developer dashboard, where you upload, publish, test and submit games (older docs call it the ACP).

Team (provider)

Your developer account on Engine, which games and payouts belong to.

RGS

The remote gaming server: Engine's API for sessions, bets, rounds and payouts.

Front end

The game's static web build, which plays the rounds the RGS picks.

Version

A frozen publish of the math or the front end. A submission pairs one of each.

Replay

Loading a past round by game, version, mode and event ID, without a session. Mandatory for approval.

Bet-level template

Engine's assigned minimum, maximum and default bets for a game, based on its risk.

2-Star and 3-Star limits

Risk tiers that set a game's maximum exposure and bet size.

Star rating

Reviewers' 0 to 3 star score, which decides whether a game is published and where it's featured.

Social mode

social=true: stake.us sweepstakes wording and currencies.

XGC, XSC, XEC

Stake Gold Coin, Stake Cash and Stake Euro Cash, the social currencies.

Engine Insights

Engine's analytics, which also order New Releases.

Engine network

Operators other than Stake that can carry a game.

GGR

Gross gaming revenue: total bets minus total wins. Developer pay is a share of it.

For how these fit together, start with How a Stake Engine game works.

Sources: Engine docs and the Stake Engine math and web SDK docs. Checked October 22, 2026.