Grub War slot: RTP and max win
Grub War is a high-volatility slot by Sandbox Studios on Stake Engine, released 1 May 2026. Its base game returns 96.01%, below the median Engine slot (96.02%). The top payout is 15,000× the bet, bigger than 50% of Engine slots; from a base spin it lands about once every 208,851 spins. It has 4 bonus buys priced at 50× to 200× the bet; the best returns 96.01%, so each buy costs 5.99× the bet on average over the long run. It is the No. 1722 most played Engine slot over the last 30 days.
Every mode, side by side
Costs are multiples of the base bet. Odds come from the published outcome table for v9. "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.
| Mode | Type | Cost | RTP | Max win | Max win odds | Pays anything | Returns the cost | Expected cost per round | |
|---|---|---|---|---|---|---|---|---|---|
| Base | Base spin | 1.00× | 96.01% | 15,000× | 1 in 208,851 | 1 in 5.09 | 1 in 15 | 0.04× base | Simulate |
| Enhanced Spin | Boosted spin | 3.00× | 96.00% | 15,000× | 1 in 105,688 | 1 in 3.85 | 1 in 16 | 0.12× base | Simulate |
| Tank Spin | Bonus buy | 50× | 96.00% | 15,000× | 1 in 19,390 | 1 in 2.91 | 1 in 6.61 | 2.00× base | Simulate |
| Bonus | Bonus buy | 100× | 95.96% | 15,000× | 1 in 13,115 | every round | 1 in 4.23 | 4.04× base | Simulate |
| Ammo Spin | Bonus buy | 150× | 96.01% | 15,000× | 1 in 4,725 | 1 in 1.01 | 1 in 3.70 | 5.99× base | Simulate |
| Super Bonus | Bonus buy | 200× | 95.99% | 15,000× | 1 in 1,413 | 1 in 1.02 | 1 in 4.60 | 8.01× base | Simulate |
Version history
Base-mode RTP per published math version. Older versions stay public in the fairness API, so changes can be checked.
| Version | Base RTP | |
|---|---|---|
| v9 | 96.009% | Active |
| v8 | 96.011% |
Frequently asked
What is the RTP of Grub War?
Base spins return 96.01% of the amount wagered over the long run, from the published outcome table for version 9. Its bonus buys return between 95.96% and 96.01%.
What is the max win in Grub War and how likely is it?
The top payout is 15,000× the base bet. On a base spin it lands 1 in 208,851 spins. In the Ammo Spin buy (150×) 15,000× lands 1 in 4,725 buys.
Does Grub War have a bonus buy, and what does it cost?
Yes, 4 buy modes. Tank Spin: 50× the base bet, 96.00% RTP, an expected cost of 2.00× the base bet per buy. Bonus: 100× the base bet, 95.96% RTP, an expected cost of 4.04× the base bet per buy. Ammo Spin: 150× the base bet, 96.01% RTP, an expected cost of 5.99× the base bet per buy. Super Bonus: 200× the base bet, 95.99% RTP, an expected cost of 8.01× the base bet per buy.
Is Grub War high or low volatility?
High. Its base-mode standard deviation is 46.4× 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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