Grim Bargain cover art

Grim Bargain slot: RTP and max win

By JP. Released 2 Nov 2026, math version 1.
High volatilityNo. 4335 most played this monthMini game

Grim Bargain is a high-volatility slot by JP on Stake Engine, released 2 Nov 2026. The top payout is 66,666× the bet; from a base spin it lands about once every 142,294,470 spins. It has 10 bonus buys priced at 20× to 1,000× the bet; the best returns 96.70%, so each buy costs 0.66× the bet on average over the long run. It is the No. 4335 most played Engine slot over the last 30 days.

Base RTP
96.70%
catalogue figure 96.700%
Max win
66,666×
of the base bet
Max win, base spins
1 in 142,294,470
66,666× top payout per spin
Base spin pays nothing
77.5%
of spins
Players, last 30 days
97
$3K wagered (Engine Insights)

Every mode, side by side

Costs are multiples of the base bet. Odds come from the published outcome table for v1. "Returns the cost" counts rounds that pay back at least what the mode cost. Expected cost is cost × (1 − RTP): the average amount lost per round over the long run.

ModeTypeCostRTPMax winMax win oddsPays anythingReturns the costExpected cost per round
BaseBase spin1.00×96.70%66,666×1 in 142,294,4701 in 4.501 in 6.900.03× base Simulate
Base HighBase spin1.00×96.70%66,666×1 in 81,792,8671 in 7.001 in 9.790.03× base Simulate
Base LowBase spin1.00×96.70%66,666×1 in 344,831,9861 in 3.001 in 5.260.03× base Simulate
AnteBoosted spin3.00×96.70%66,666×1 in 47,988,7851 in 2.071 in 200.10× base Simulate
Ante HighBoosted spin3.00×96.70%66,666×1 in 27,762,1631 in 1.891 in 160.10× base Simulate
Ante LowBoosted spin3.00×96.70%66,666×1 in 109,891,8011 in 2.221 in 210.10× base Simulate
Super AnteBoosted spin6.00×96.70%66,666×1 in 7,117,2721 in 2.081 in 620.20× base Simulate
Super Ante HighBoosted spin6.00×96.70%66,666×1 in 5,450,5171 in 1.891 in 490.20× base Simulate
Super Ante LowBoosted spin6.00×96.70%66,666×1 in 10,810,4721 in 2.251 in 620.20× base Simulate
Epic AnteBonus buy20×96.70%66,666×1 in 837,0421 in 2.091 in 750.66× base Simulate
Epic Ante HighBonus buy20×96.70%66,666×1 in 748,7121 in 1.901 in 830.66× base Simulate
Epic Ante LowBonus buy20×96.70%66,666×1 in 1,121,6401 in 2.261 in 630.66× base Simulate
SuperBonus buy300×96.70%66,666×1 in 100,000–1 in 6.479.90× base Simulate
Super HighBonus buy300×96.70%66,666×1 in 76,923–1 in 6.529.90× base Simulate
Super LowBonus buy300×96.70%66,666×1 in 166,667–1 in 6.429.90× base Simulate
MysteryBonus buy500×96.70%66,666×1 in 80,0011 in 1.461 in 6.9216.50× base Simulate
Mystery HighBonus buy500×96.70%66,666×1 in 56,9811 in 1.481 in 6.9816.50× base Simulate
Mystery LowBonus buy500×96.70%66,666×1 in 123,4591 in 1.361 in 6.6416.50× base Simulate
DoorBonus buy1,000×96.70%66,666×1 in 25,000every round1 in 3.9133.00× base Simulate

Work out the cost of Grim Bargain bonus buys at your bet size

Version history

Base-mode RTP per published math version. Older versions stay public in the fairness API, so changes can be checked.

VersionBase RTP
v196.700%Active

Frequently asked

What is the RTP of Grim Bargain?

Base spins return 96.70% of the amount wagered over the long run, from the published outcome table for version 1. All 10 of its bonus buys return 96.70%.

What is the max win in Grim Bargain and how likely is it?

The top payout is 66,666× the base bet. On a base spin it lands 1 in 142,294,470 spins. In the Epic Ante buy (20×) 66,666× lands 1 in 837,042 buys.

Does Grim Bargain have a bonus buy, and what does it cost?

Yes, 10 buy modes. Epic Ante: 20× the base bet, 96.70% RTP, an expected cost of 0.66× the base bet per buy. Epic Ante High: 20× the base bet, 96.70% RTP, an expected cost of 0.66× the base bet per buy. Epic Ante Low: 20× the base bet, 96.70% RTP, an expected cost of 0.66× the base bet per buy. Super: 300× the base bet, 96.70% RTP, an expected cost of 9.90× the base bet per buy. Super High: 300× the base bet, 96.70% RTP, an expected cost of 9.90× the base bet per buy. Super Low: 300× the base bet, 96.70% RTP, an expected cost of 9.90× the base bet per buy. Mystery: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Mystery High: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Mystery Low: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Door: 1,000× the base bet, 96.70% RTP, an expected cost of 33.00× the base bet per buy.

Is Grim Bargain high or low volatility?

High. Its base-mode standard deviation is 45.6× the bet, which puts it in the highest third of Engine games. What volatility means.

Can I check that a result was fair?

Yes. Engine games use provably fair seeds. Once your server seed is revealed you can replay any round against the published outcome table. See how to verify a result.

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