Grandpa Bingo slot: RTP and max win
Grandpa Bingo is a low-volatility slot by Caleta Gaming on Stake Engine, released 2 Oct 2026. Its base game returns 96.00%, below the median Engine slot (96.02%). The top payout is 2,528× the bet. It has 2 bonus buys priced at 110× to 140× the bet; the best returns 96.00%, so each buy costs 4.40× the bet on average over the long run. It is the No. 1461 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 v7. "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 4 | Base spin | 1.00× | 96.00% | 1,251× | 1 in 5,201,642 | 1 in 1.97 | 1 in 33 | 0.04× base | Simulate |
| Auto Eb 6b 4 | Boosted spin | 3.00× | 96.00% | 2,504× | 1 in 849,553 | 1 in 2.07 | 1 in 11 | 0.12× base | Simulate |
| Auto Eb 12b 4 | Boosted spin | 11× | 96.00% | 2,528× | 1 in 455,021 | 1 in 1.99 | 1 in 6.35 | 0.44× base | Simulate |
| Bonus1 4 | Bonus buy | 110× | 96.00% | 206× | 1 in 848 | – | 1 in 1.67 | 4.40× base | Simulate |
| Bonus2 4 | Bonus buy | 140× | 96.00% | 875× | 1 in 1,197 | – | 1 in 3.37 | 5.60× base | Simulate |
Work out the cost of Grandpa Bingo 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.
| Version | Base RTP | |
|---|---|---|
| v7 | 96.000% | Active |
Frequently asked
What is the RTP of Grandpa Bingo?
Base spins return 96.00% of the amount wagered over the long run, from the published outcome table for version 7. All 2 of its bonus buys return 96.00%.
What is the max win in Grandpa Bingo and how likely is it?
The top payout is 2,528× the base bet. On a base spin the top payout of 1,251× lands 1 in 5,201,642 spins. In the Bonus1 4 buy (110×) 206× lands 1 in 848 buys.
Does Grandpa Bingo have a bonus buy, and what does it cost?
Yes, 2 buy modes. Bonus1 4: 110× the base bet, 96.00% RTP, an expected cost of 4.40× the base bet per buy. Bonus2 4: 140× the base bet, 96.00% RTP, an expected cost of 5.60× the base bet per buy.
Is Grandpa Bingo high or low volatility?
Low. Its base-mode standard deviation is 6.5× the bet, which puts it in the lowest 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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