The RTP Ledger snapshot of the Stake Engine catalogue checked 2026-08-19 displays Cat Stacks by OneSpin at 95.81% base RTP, rounded to two decimal places for presentation and equivalent to a 4.19% displayed theoretical house edge. RTP Ledger lists 6 published modes separately; the figures do not predict one session or establish a live casino configuration.
At 95.81%, the theoretical long-run cost is $4.19 per $100 wagered. The base RTP is higher than 14.9% of the 2,830 other Stake Engine games with a base figure. The base RTP is 0.19 percentage points below the median for the compared Stake Engine games.
At the two-decimal display precision, 3 modes share the highest displayed RTP of 95.99%: BONUS, EPIC BONUS, and SUPER BONUS. BASE has the lowest displayed RTP at 95.81%. The difference between the displayed extremes is 0.18 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 | 95.81% | 4.19% | 100,000 |
| ANTE | Other feature or mode | 95.95% | 4.05% | 100,000 |
| FULL SCREEN | Other feature or mode | 95.88% | 4.12% | 100,000 |
| BONUS | Other feature or mode | 95.99% | 4.01% | 100,000 |
| SUPER BONUS | Other feature or mode | 95.99% | 4.01% | 100,000 |
| EPIC BONUS | Other feature or mode | 95.99% | 4.01% | 100,000 |
RTP Ledger checked Stake Engine (fair.stake-engine.com) on 2026-08-19. 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 2026-08-19. It displays a 95.81% base RTP for Cat Stacks by OneSpin, rounded to two decimals for presentation. The corresponding displayed theoretical house edge is 4.19%; neither figure predicts one session.
At the two-decimal display precision, 3 modes share the highest displayed RTP of 95.99%: BONUS, EPIC BONUS, and SUPER BONUS. BASE has the lowest displayed RTP at 95.81%.
RTP Ledger uses the mode RTP values and reported event counts in the Stake Engine catalogue snapshot dated 2026-08-19. 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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OneSpin has 11 games in the catalogue with a median base RTP of 96.1%. Cat Stacks ranks #11 of 11 rated titles from this studio.
Version 10, first recorded by RTP Ledger on 2026-08-19. No version change has been recorded since tracking began.