The RTP Ledger snapshot of the Stake Engine catalogue checked 2026-09-26 displays MYSTERYBOX by GUY STUDIO at 96.21% base RTP, rounded to two decimal places for presentation and equivalent to a 3.79% displayed theoretical house edge. RTP Ledger lists 5 published modes separately; the figures do not predict one session or establish a live casino configuration.
At 96.21%, the theoretical long-run cost is $3.79 per $100 wagered. The base RTP is higher than 65.4% of the 4,035 other Stake Engine games with a base figure. The base RTP is 0.21 percentage points above the median for the compared Stake Engine games.
At the two-decimal display precision, 5 modes share the highest displayed RTP of 96.21%: a1, base, and bonus and 2 more. 5 modes share the lowest displayed RTP of 96.21%: a1, base, and bonus and 2 more. The difference between the displayed extremes is 0 percentage points.
The expected-cost figures apply over a very large number of bets. The figures do not predict what one player will win or lose in a session.
| Mode | Type | Published RTP | House edge | Reported events |
|---|---|---|---|---|
| base | Base game | 96.21% | 3.79% | 400,000 |
| bonus | Other feature or mode | 96.21% | 3.79% | 200,000 |
| triple boost | Other feature or mode | 96.21% | 3.79% | 400,000 |
| superbonus | Other feature or mode | 96.21% | 3.79% | 200,000 |
| a1 | Other feature or mode | 96.21% | 3.79% | 150,000 |
RTP Ledger checked Stake Engine (fair.stake-engine.com) on 2026-09-26. RTP Ledger displays each published mode RTP rounded to two decimal places and calculates house edge as 100 − displayed RTP. “Reported events” preserves the source field name; it is not labelled as observed rounds or unique outcomes. RTP Ledger does not independently recalculate the catalogue RTP from weights and payouts.
RTP Ledger checked the Stake Engine catalogue on 2026-09-26. It displays a 96.21% base RTP for MYSTERYBOX by GUY STUDIO, rounded to two decimals for presentation. The corresponding displayed theoretical house edge is 3.79%; neither figure predicts one session.
At the two-decimal display precision, 5 modes share the highest displayed RTP of 96.21%: a1, base, and bonus and 2 more. 5 modes share the lowest displayed RTP of 96.21%: a1, base, and bonus and 2 more.
RTP Ledger uses the mode RTP values and reported event counts in the Stake Engine catalogue snapshot dated 2026-09-26. RTP values are rounded to two decimal places for presentation while the source precision remains in the data record. The source field is named “events”; RTP Ledger does not relabel it as observed rounds or unique outcomes.
Stake Engine published the catalogue used for the game record. Compare the in-game mode with the published mode table before you play. RTP Ledger can earn a commission if you open Stake through the link. The commission does not change the RTP figures, the publication decision, or the order of records.
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GUY STUDIO has 6 games in the catalogue with a median base RTP of 96.55%. MYSTERYBOX ranks #5 of 6 rated titles from this studio.
Version 1, first recorded by RTP Ledger on 2026-09-26. No version change has been recorded since tracking began.
The catalogue keeps 1 published version of MYSTERYBOX. The catalogue does not date its versions; the last column shows when RTP Ledger first recorded a version as active. All Stake Engine moves are listed on the RTP changes page.
| Version | Base RTP | Best buy RTP | Modes | Status | First recorded by RTP Ledger |
|---|---|---|---|---|---|
| v1 | 96.21% | — | 5 | Active | 2026-09-26 |