Tower Stack slot: RTP and max win

By Black Rift. Released 10 Apr 2026, math version 24.

Low volatilityNo. 4730 most played this monthMini game

Tower Stack is a low-volatility slot by Black Rift on Stake Engine, released 10 Apr 2026. The top payout is 10,011× the bet. It has 2 bonus buys priced at 20× to 50× the bet; the best returns 96.50%, so each buy costs 0.70× the bet on average over the long run. It is the No. 4730 most played Engine slot over the last 30 days.

Base RTP

96.50%

catalogue figure 96.500%

Max win

10,011×

of the base bet

Max win, base spins

1 in 1.34

1.29× top payout per spin

Base spin pays nothing

25.2%

of spins

Players, last 30 days

147

$2K wagered (Engine Insights)

The 10,011× max win can't be reached from base spins in the published math. Base spins top out at 1.29×.

Every mode, side by side

Costs are multiples of the base bet. Odds come from the published outcome table for v24. "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
Expert 1	Base spin	1.00×	96.50%	1.29×	1 in 1.34	1 in 1.34	1 in 1.34	0.04× base	Simulate
Expert 10	Base spin	1.00×	96.50%	13×	1 in 13	1 in 13	1 in 13	0.04× base	Simulate
Expert 11	Base spin	1.00×	96.50%	16×	1 in 17	1 in 17	1 in 17	0.04× base	Simulate
Expert 12	Base spin	1.00×	96.50%	21×	1 in 22	1 in 22	1 in 22	0.04× base	Simulate
Expert 13	Base spin	1.00×	96.50%	27×	1 in 28	1 in 28	1 in 28	0.03× base	Simulate
Expert 14	Base spin	1.00×	96.50%	35×	1 in 36	1 in 36	1 in 36	0.03× base	Simulate
Expert 15	Base spin	1.00×	96.50%	45×	1 in 46	1 in 46	1 in 46	0.04× base	Simulate
Expert 16	Base spin	1.00×	96.50%	58×	1 in 60	1 in 60	1 in 60	0.04× base	Simulate
Expert 17	Base spin	1.00×	96.50%	74×	1 in 77	1 in 77	1 in 77	0.04× base	Simulate
Expert 18	Base spin	1.00×	96.50%	96×	1 in 99	1 in 99	1 in 99	0.03× base	Simulate
Expert 19	Base spin	1.00×	96.50%	123×	1 in 128	1 in 128	1 in 128	0.04× base	Simulate
Expert 2	Base spin	1.00×	96.50%	1.66×	1 in 1.72	1 in 1.72	1 in 1.72	0.04× base	Simulate
Expert 20	Base spin	1.00×	96.51%	159×	1 in 165	1 in 165	1 in 165	0.03× base	Simulate
Expert 21	Base spin	1.00×	96.51%	205×	1 in 212	1 in 212	1 in 212	0.03× base	Simulate
Expert 22	Base spin	1.00×	96.49%	264×	1 in 273	1 in 273	1 in 273	0.04× base	Simulate
Expert 23	Base spin	1.00×	96.49%	340×	1 in 352	1 in 352	1 in 352	0.04× base	Simulate
Expert 24	Base spin	1.00×	96.52%	438×	1 in 454	1 in 454	1 in 454	0.03× base	Simulate
Expert 25	Base spin	1.00×	96.50%	564×	1 in 584	1 in 584	1 in 584	0.04× base	Simulate
Expert 26	Base spin	1.00×	96.50%	727×	1 in 753	1 in 753	1 in 753	0.04× base	Simulate
Expert 27	Base spin	1.00×	96.52%	936×	1 in 970	1 in 970	1 in 970	0.03× base	Simulate
Expert 28	Base spin	1.00×	96.50%	1,206×	1 in 1,250	1 in 1,250	1 in 1,250	0.04× base	Simulate
Expert 29	Base spin	1.00×	96.51%	1,554×	1 in 1,610	1 in 1,610	1 in 1,610	0.03× base	Simulate
Expert 3	Base spin	1.00×	96.50%	2.14×	1 in 2.22	1 in 2.22	1 in 2.22	0.04× base	Simulate
Expert 30	Base spin	1.00×	96.51%	2,002×	1 in 2,075	1 in 2,075	1 in 2,075	0.03× base	Simulate
Expert 4	Base spin	1.00×	96.50%	2.76×	1 in 2.86	1 in 2.86	1 in 2.86	0.04× base	Simulate
Expert 5	Base spin	1.00×	96.50%	3.55×	1 in 3.68	1 in 3.68	1 in 3.68	0.04× base	Simulate
Expert 6	Base spin	1.00×	96.50%	4.57×	1 in 4.74	1 in 4.74	1 in 4.74	0.04× base	Simulate
Expert 7	Base spin	1.00×	96.50%	5.89×	1 in 6.10	1 in 6.10	1 in 6.10	0.04× base	Simulate
Expert 8	Base spin	1.00×	96.50%	7.59×	1 in 7.87	1 in 7.87	1 in 7.87	0.04× base	Simulate
Expert 9	Base spin	1.00×	96.50%	9.78×	1 in 10	1 in 10	1 in 10	0.04× base	Simulate
Gate Expert	Base spin	1.00×	96.50%	5.00×	1 in 26	1 in 2.10	1 in 2.62	0.04× base	Simulate
Gate Hard	Base spin	1.00×	96.50%	3.50×	1 in 38	1 in 1.51	1 in 1.94	0.04× base	Simulate
Gate Normal	Base spin	1.00×	96.50%	2.50×	1 in 26	1 in 1.31	1 in 1.75	0.04× base	Simulate
Hard 1	Base spin	1.00×	96.50%	1.15×	1 in 1.19	1 in 1.19	1 in 1.19	0.04× base	Simulate
Hard 10	Base spin	1.00×	96.50%	4.05×	1 in 4.20	1 in 4.20	1 in 4.20	0.04× base	Simulate
Hard 11	Base spin	1.00×	96.50%	4.65×	1 in 4.82	1 in 4.82	1 in 4.82	0.04× base	Simulate
Hard 12	Base spin	1.00×	96.50%	5.35×	1 in 5.54	1 in 5.54	1 in 5.54	0.04× base	Simulate
Hard 13	Base spin	1.00×	96.50%	6.15×	1 in 6.37	1 in 6.37	1 in 6.37	0.04× base	Simulate
Hard 14	Base spin	1.00×	96.50%	7.08×	1 in 7.34	1 in 7.34	1 in 7.34	0.04× base	Simulate
Hard 15	Base spin	1.00×	96.50%	8.14×	1 in 8.44	1 in 8.44	1 in 8.44	0.04× base	Simulate
Hard 16	Base spin	1.00×	96.50%	9.36×	1 in 9.70	1 in 9.70	1 in 9.70	0.04× base	Simulate
Hard 17	Base spin	1.00×	96.50%	11×	1 in 11	1 in 11	1 in 11	0.04× base	Simulate
Hard 18	Base spin	1.00×	96.50%	12×	1 in 13	1 in 13	1 in 13	0.04× base	Simulate
Hard 19	Base spin	1.00×	96.50%	14×	1 in 15	1 in 15	1 in 15	0.04× base	Simulate
Hard 2	Base spin	1.00×	96.50%	1.32×	1 in 1.37	1 in 1.37	1 in 1.37	0.04× base	Simulate
Hard 20	Base spin	1.00×	96.50%	16×	1 in 17	1 in 17	1 in 17	0.04× base	Simulate
Hard 21	Base spin	1.00×	96.50%	19×	1 in 20	1 in 20	1 in 20	0.04× base	Simulate
Hard 22	Base spin	1.00×	96.50%	22×	1 in 22	1 in 22	1 in 22	0.04× base	Simulate
Hard 23	Base spin	1.00×	96.50%	25×	1 in 26	1 in 26	1 in 26	0.03× base	Simulate
Hard 24	Base spin	1.00×	96.50%	29×	1 in 30	1 in 30	1 in 30	0.04× base	Simulate
Hard 25	Base spin	1.00×	96.50%	33×	1 in 34	1 in 34	1 in 34	0.04× base	Simulate
Hard 26	Base spin	1.00×	96.50%	38×	1 in 39	1 in 39	1 in 39	0.03× base	Simulate
Hard 27	Base spin	1.00×	96.50%	44×	1 in 45	1 in 45	1 in 45	0.03× base	Simulate
Hard 28	Base spin	1.00×	96.50%	50×	1 in 52	1 in 52	1 in 52	0.04× base	Simulate
Hard 29	Base spin	1.00×	96.50%	58×	1 in 60	1 in 60	1 in 60	0.04× base	Simulate
Hard 3	Base spin	1.00×	96.50%	1.52×	1 in 1.58	1 in 1.58	1 in 1.58	0.04× base	Simulate
Hard 30	Base spin	1.00×	96.50%	66×	1 in 69	1 in 69	1 in 69	0.03× base	Simulate
Hard 4	Base spin	1.00×	96.50%	1.75×	1 in 1.81	1 in 1.81	1 in 1.81	0.04× base	Simulate
Hard 5	Base spin	1.00×	96.50%	2.01×	1 in 2.08	1 in 2.08	1 in 2.08	0.04× base	Simulate
Hard 6	Base spin	1.00×	96.50%	2.31×	1 in 2.39	1 in 2.39	1 in 2.39	0.04× base	Simulate
Hard 7	Base spin	1.00×	96.50%	2.66×	1 in 2.76	1 in 2.76	1 in 2.76	0.04× base	Simulate
Hard 8	Base spin	1.00×	96.50%	3.06×	1 in 3.17	1 in 3.17	1 in 3.17	0.04× base	Simulate
Hard 9	Base spin	1.00×	96.50%	3.52×	1 in 3.65	1 in 3.65	1 in 3.65	0.04× base	Simulate
Normal 1	Base spin	1.00×	96.50%	1.07×	1 in 1.11	1 in 1.11	1 in 1.11	0.04× base	Simulate
Normal 10	Base spin	1.00×	96.50%	1.97×	1 in 2.04	1 in 2.04	1 in 2.04	0.04× base	Simulate
Normal 11	Base spin	1.00×	96.50%	2.10×	1 in 2.18	1 in 2.18	1 in 2.18	0.04× base	Simulate
Normal 12	Base spin	1.00×	96.50%	2.25×	1 in 2.33	1 in 2.33	1 in 2.33	0.04× base	Simulate
Normal 13	Base spin	1.00×	96.50%	2.41×	1 in 2.50	1 in 2.50	1 in 2.50	0.04× base	Simulate
Normal 14	Base spin	1.00×	96.50%	2.58×	1 in 2.67	1 in 2.67	1 in 2.67	0.04× base	Simulate
Normal 15	Base spin	1.00×	96.50%	2.76×	1 in 2.86	1 in 2.86	1 in 2.86	0.04× base	Simulate
Normal 16	Base spin	1.00×	96.50%	2.95×	1 in 3.06	1 in 3.06	1 in 3.06	0.04× base	Simulate
Normal 17	Base spin	1.00×	96.50%	3.16×	1 in 3.27	1 in 3.27	1 in 3.27	0.04× base	Simulate
Normal 18	Base spin	1.00×	96.50%	3.38×	1 in 3.50	1 in 3.50	1 in 3.50	0.04× base	Simulate
Normal 19	Base spin	1.00×	96.50%	3.62×	1 in 3.75	1 in 3.75	1 in 3.75	0.04× base	Simulate
Normal 2	Base spin	1.00×	96.50%	1.14×	1 in 1.18	1 in 1.18	1 in 1.18	0.04× base	Simulate
Normal 20	Base spin	1.00×	96.50%	3.87×	1 in 4.01	1 in 4.01	1 in 4.01	0.04× base	Simulate
Normal 21	Base spin	1.00×	96.50%	4.14×	1 in 4.29	1 in 4.29	1 in 4.29	0.04× base	Simulate
Normal 22	Base spin	1.00×	96.50%	4.43×	1 in 4.59	1 in 4.59	1 in 4.59	0.04× base	Simulate
Normal 23	Base spin	1.00×	96.50%	4.74×	1 in 4.91	1 in 4.91	1 in 4.91	0.04× base	Simulate
Normal 24	Base spin	1.00×	96.50%	5.07×	1 in 5.25	1 in 5.25	1 in 5.25	0.04× base	Simulate
Normal 25	Base spin	1.00×	96.50%	5.43×	1 in 5.63	1 in 5.63	1 in 5.63	0.04× base	Simulate
Normal 26	Base spin	1.00×	96.50%	5.81×	1 in 6.02	1 in 6.02	1 in 6.02	0.04× base	Simulate
Normal 27	Base spin	1.00×	96.50%	6.21×	1 in 6.44	1 in 6.44	1 in 6.44	0.04× base	Simulate
Normal 28	Base spin	1.00×	96.50%	6.65×	1 in 6.89	1 in 6.89	1 in 6.89	0.04× base	Simulate
Normal 29	Base spin	1.00×	96.50%	7.11×	1 in 7.37	1 in 7.37	1 in 7.37	0.04× base	Simulate
Normal 3	Base spin	1.00×	96.50%	1.23×	1 in 1.27	1 in 1.27	1 in 1.27	0.04× base	Simulate
Normal 30	Base spin	1.00×	96.50%	7.61×	1 in 7.89	1 in 7.89	1 in 7.89	0.04× base	Simulate
Normal 4	Base spin	1.00×	96.50%	1.31×	1 in 1.36	1 in 1.36	1 in 1.36	0.04× base	Simulate
Normal 5	Base spin	1.00×	96.50%	1.40×	1 in 1.45	1 in 1.45	1 in 1.45	0.04× base	Simulate
Normal 6	Base spin	1.00×	96.50%	1.50×	1 in 1.55	1 in 1.55	1 in 1.55	0.04× base	Simulate
Normal 7	Base spin	1.00×	96.50%	1.61×	1 in 1.67	1 in 1.67	1 in 1.67	0.04× base	Simulate
Normal 8	Base spin	1.00×	96.50%	1.72×	1 in 1.78	1 in 1.78	1 in 1.78	0.04× base	Simulate
Normal 9	Base spin	1.00×	96.50%	1.84×	1 in 1.91	1 in 1.91	1 in 1.91	0.04× base	Simulate
Lucky Expert 1	Boosted spin	2.00×	96.51%	6.45×	1 in 10	1 in 1.26	1 in 3.60	0.07× base	Simulate
Lucky Expert 10	Boosted spin	2.00×	96.50%	63×	1 in 99	1 in 12	1 in 12	0.07× base	Simulate
Lucky Expert 11	Boosted spin	2.00×	96.50%	81×	1 in 127	1 in 16	1 in 16	0.07× base	Simulate
Lucky Expert 12	Boosted spin	2.00×	96.50%	105×	1 in 164	1 in 20	1 in 20	0.07× base	Simulate
Lucky Expert 13	Boosted spin	2.00×	96.50%	135×	1 in 211	1 in 26	1 in 26	0.07× base	Simulate
Lucky Expert 14	Boosted spin	2.00×	96.50%	174×	1 in 272	1 in 34	1 in 34	0.07× base	Simulate
Lucky Expert 15	Boosted spin	2.00×	96.50%	224×	1 in 350	1 in 44	1 in 44	0.07× base	Simulate
Lucky Expert 16	Boosted spin	2.00×	96.50%	288×	1 in 451	1 in 56	1 in 56	0.07× base	Simulate
Lucky Expert 17	Boosted spin	2.00×	96.50%	371×	1 in 581	1 in 73	1 in 73	0.07× base	Simulate
Lucky Expert 18	Boosted spin	2.00×	96.50%	478×	1 in 748	1 in 94	1 in 94	0.07× base	Simulate
Lucky Expert 19	Boosted spin	2.00×	96.50%	616×	1 in 964	1 in 121	1 in 121	0.07× base	Simulate
Lucky Expert 2	Boosted spin	2.00×	96.50%	8.30×	1 in 13	1 in 1.62	1 in 3.82	0.07× base	Simulate
Lucky Expert 20	Boosted spin	2.00×	96.50%	794×	1 in 1,244	1 in 155	1 in 155	0.07× base	Simulate
Lucky Expert 21	Boosted spin	2.00×	96.50%	1,023×	1 in 1,603	1 in 200	1 in 200	0.07× base	Simulate
Lucky Expert 22	Boosted spin	2.00×	96.49%	1,318×	1 in 2,062	1 in 258	1 in 258	0.07× base	Simulate
Lucky Expert 23	Boosted spin	2.00×	96.49%	1,699×	1 in 2,660	1 in 332	1 in 332	0.07× base	Simulate
Lucky Expert 24	Boosted spin	2.00×	96.51%	2,189×	1 in 3,425	1 in 428	1 in 428	0.07× base	Simulate
Lucky Expert 25	Boosted spin	2.00×	96.50%	2,820×	1 in 4,405	1 in 552	1 in 552	0.07× base	Simulate
Lucky Expert 26	Boosted spin	2.00×	96.50%	3,633×	1 in 5,682	1 in 710	1 in 710	0.07× base	Simulate
Lucky Expert 27	Boosted spin	2.00×	96.52%	4,681×	1 in 7,299	1 in 916	1 in 916	0.07× base	Simulate
Lucky Expert 28	Boosted spin	2.00×	96.50%	6,031×	1 in 9,434	1 in 1,179	1 in 1,179	0.07× base	Simulate
Lucky Expert 29	Boosted spin	2.00×	96.47%	7,770×	1 in 12,195	1 in 1,520	1 in 1,520	0.07× base	Simulate
Lucky Expert 3	Boosted spin	2.00×	96.50%	11×	1 in 17	1 in 2.09	1 in 2.09	0.07× base	Simulate
Lucky Expert 30	Boosted spin	2.00×	96.51%	10,011×	1 in 15,625	1 in 1,961	1 in 1,961	0.07× base	Simulate
Lucky Expert 4	Boosted spin	2.00×	96.50%	14×	1 in 22	1 in 2.70	1 in 2.70	0.07× base	Simulate
Lucky Expert 5	Boosted spin	2.00×	96.50%	18×	1 in 28	1 in 3.47	1 in 3.47	0.07× base	Simulate
Lucky Expert 6	Boosted spin	2.00×	96.50%	23×	1 in 36	1 in 4.47	1 in 4.47	0.07× base	Simulate
Lucky Expert 7	Boosted spin	2.00×	96.50%	29×	1 in 46	1 in 5.76	1 in 5.76	0.07× base	Simulate
Lucky Expert 8	Boosted spin	2.00×	96.50%	38×	1 in 59	1 in 7.42	1 in 7.42	0.07× base	Simulate
Lucky Expert 9	Boosted spin	2.00×	96.50%	49×	1 in 77	1 in 9.56	1 in 9.56	0.07× base	Simulate
Lucky Hard 1	Boosted spin	2.00×	96.51%	5.75×	1 in 9.00	1 in 1.12	1 in 3.21	0.07× base	Simulate
Lucky Hard 10	Boosted spin	2.00×	96.50%	20×	1 in 32	1 in 3.96	1 in 3.96	0.07× base	Simulate
Lucky Hard 11	Boosted spin	2.00×	96.50%	23×	1 in 36	1 in 4.55	1 in 4.55	0.07× base	Simulate
Lucky Hard 12	Boosted spin	2.00×	96.50%	27×	1 in 42	1 in 5.23	1 in 5.23	0.07× base	Simulate
Lucky Hard 13	Boosted spin	2.00×	96.50%	31×	1 in 48	1 in 6.01	1 in 6.01	0.07× base	Simulate
Lucky Hard 14	Boosted spin	2.00×	96.50%	35×	1 in 55	1 in 6.92	1 in 6.92	0.07× base	Simulate
Lucky Hard 15	Boosted spin	2.00×	96.50%	41×	1 in 64	1 in 7.96	1 in 7.96	0.07× base	Simulate
Lucky Hard 16	Boosted spin	2.00×	96.50%	47×	1 in 73	1 in 9.15	1 in 9.15	0.07× base	Simulate
Lucky Hard 17	Boosted spin	2.00×	96.50%	54×	1 in 84	1 in 11	1 in 11	0.07× base	Simulate
Lucky Hard 18	Boosted spin	2.00×	96.50%	62×	1 in 97	1 in 12	1 in 12	0.07× base	Simulate
Lucky Hard 19	Boosted spin	2.00×	96.50%	71×	1 in 111	1 in 14	1 in 14	0.07× base	Simulate
Lucky Hard 2	Boosted spin	2.00×	96.50%	6.60×	1 in 10	1 in 1.29	1 in 3.69	0.07× base	Simulate
Lucky Hard 20	Boosted spin	2.00×	96.50%	82×	1 in 128	1 in 16	1 in 16	0.07× base	Simulate
Lucky Hard 21	Boosted spin	2.00×	96.50%	94×	1 in 147	1 in 18	1 in 18	0.07× base	Simulate
Lucky Hard 22	Boosted spin	2.00×	96.50%	108×	1 in 169	1 in 21	1 in 21	0.07× base	Simulate
Lucky Hard 23	Boosted spin	2.00×	96.50%	124×	1 in 195	1 in 24	1 in 24	0.07× base	Simulate
Lucky Hard 24	Boosted spin	2.00×	96.50%	143×	1 in 224	1 in 28	1 in 28	0.07× base	Simulate
Lucky Hard 25	Boosted spin	2.00×	96.50%	165×	1 in 258	1 in 32	1 in 32	0.07× base	Simulate
Lucky Hard 26	Boosted spin	2.00×	96.50%	189×	1 in 296	1 in 37	1 in 37	0.07× base	Simulate
Lucky Hard 27	Boosted spin	2.00×	96.50%	218×	1 in 341	1 in 43	1 in 43	0.07× base	Simulate
Lucky Hard 28	Boosted spin	2.00×	96.50%	250×	1 in 392	1 in 49	1 in 49	0.07× base	Simulate
Lucky Hard 29	Boosted spin	2.00×	96.50%	288×	1 in 450	1 in 56	1 in 56	0.07× base	Simulate
Lucky Hard 3	Boosted spin	2.00×	96.50%	7.60×	1 in 12	1 in 1.49	1 in 3.50	0.07× base	Simulate
Lucky Hard 30	Boosted spin	2.00×	96.50%	331×	1 in 518	1 in 65	1 in 65	0.07× base	Simulate
Lucky Hard 4	Boosted spin	2.00×	96.50%	8.75×	1 in 14	1 in 1.71	1 in 4.03	0.07× base	Simulate
Lucky Hard 5	Boosted spin	2.00×	96.50%	10×	1 in 16	1 in 1.97	1 in 1.97	0.07× base	Simulate
Lucky Hard 6	Boosted spin	2.00×	96.50%	12×	1 in 18	1 in 2.26	1 in 2.26	0.07× base	Simulate
Lucky Hard 7	Boosted spin	2.00×	96.50%	13×	1 in 21	1 in 2.60	1 in 2.60	0.07× base	Simulate
Lucky Hard 8	Boosted spin	2.00×	96.50%	15×	1 in 24	1 in 2.99	1 in 2.99	0.07× base	Simulate
Lucky Hard 9	Boosted spin	2.00×	96.50%	18×	1 in 28	1 in 3.44	1 in 3.44	0.07× base	Simulate
Lucky Normal 1	Boosted spin	2.00×	96.51%	5.35×	1 in 8.37	1 in 1.05	1 in 2.99	0.07× base	Simulate
Lucky Normal 10	Boosted spin	2.00×	96.50%	9.85×	1 in 15	1 in 1.93	1 in 4.53	0.07× base	Simulate
Lucky Normal 11	Boosted spin	2.00×	96.50%	10×	1 in 16	1 in 2.05	1 in 2.05	0.07× base	Simulate
Lucky Normal 12	Boosted spin	2.00×	96.50%	11×	1 in 18	1 in 2.20	1 in 2.20	0.07× base	Simulate
Lucky Normal 13	Boosted spin	2.00×	96.50%	12×	1 in 19	1 in 2.36	1 in 2.36	0.07× base	Simulate
Lucky Normal 14	Boosted spin	2.00×	96.50%	13×	1 in 20	1 in 2.52	1 in 2.52	0.07× base	Simulate
Lucky Normal 15	Boosted spin	2.00×	96.50%	14×	1 in 22	1 in 2.70	1 in 2.70	0.07× base	Simulate
Lucky Normal 16	Boosted spin	2.00×	96.50%	15×	1 in 23	1 in 2.89	1 in 2.89	0.07× base	Simulate
Lucky Normal 17	Boosted spin	2.00×	96.50%	16×	1 in 25	1 in 3.09	1 in 3.09	0.07× base	Simulate
Lucky Normal 18	Boosted spin	2.00×	96.50%	17×	1 in 26	1 in 3.31	1 in 3.31	0.07× base	Simulate
Lucky Normal 19	Boosted spin	2.00×	96.50%	18×	1 in 28	1 in 3.54	1 in 3.54	0.07× base	Simulate
Lucky Normal 2	Boosted spin	2.00×	96.50%	5.70×	1 in 8.92	1 in 1.11	1 in 3.19	0.07× base	Simulate
Lucky Normal 20	Boosted spin	2.00×	96.50%	19×	1 in 30	1 in 3.78	1 in 3.78	0.07× base	Simulate
Lucky Normal 21	Boosted spin	2.00×	96.50%	21×	1 in 32	1 in 4.05	1 in 4.05	0.07× base	Simulate
Lucky Normal 22	Boosted spin	2.00×	96.50%	22×	1 in 35	1 in 4.33	1 in 4.33	0.07× base	Simulate
Lucky Normal 23	Boosted spin	2.00×	96.50%	24×	1 in 37	1 in 4.64	1 in 4.64	0.07× base	Simulate
Lucky Normal 24	Boosted spin	2.00×	96.50%	25×	1 in 40	1 in 4.96	1 in 4.96	0.07× base	Simulate
Lucky Normal 25	Boosted spin	2.00×	96.50%	27×	1 in 42	1 in 5.31	1 in 5.31	0.07× base	Simulate
Lucky Normal 26	Boosted spin	2.00×	96.50%	29×	1 in 45	1 in 5.68	1 in 5.68	0.07× base	Simulate
Lucky Normal 27	Boosted spin	2.00×	96.50%	31×	1 in 49	1 in 6.07	1 in 6.07	0.07× base	Simulate
Lucky Normal 28	Boosted spin	2.00×	96.50%	33×	1 in 52	1 in 6.50	1 in 6.50	0.07× base	Simulate
Lucky Normal 29	Boosted spin	2.00×	96.50%	36×	1 in 56	1 in 6.95	1 in 6.95	0.07× base	Simulate
Lucky Normal 3	Boosted spin	2.00×	96.51%	6.15×	1 in 9.63	1 in 1.20	1 in 3.44	0.07× base	Simulate
Lucky Normal 30	Boosted spin	2.00×	96.50%	38×	1 in 60	1 in 7.44	1 in 7.44	0.07× base	Simulate
Lucky Normal 4	Boosted spin	2.00×	96.51%	6.55×	1 in 10	1 in 1.28	1 in 3.66	0.07× base	Simulate
Lucky Normal 5	Boosted spin	2.00×	96.50%	7.00×	1 in 11	1 in 1.37	1 in 3.22	0.07× base	Simulate
Lucky Normal 6	Boosted spin	2.00×	96.50%	7.50×	1 in 12	1 in 1.47	1 in 3.45	0.07× base	Simulate
Lucky Normal 7	Boosted spin	2.00×	96.50%	8.05×	1 in 13	1 in 1.57	1 in 3.71	0.07× base	Simulate
Lucky Normal 8	Boosted spin	2.00×	96.50%	8.60×	1 in 13	1 in 1.68	1 in 3.96	0.07× base	Simulate
Lucky Normal 9	Boosted spin	2.00×	96.50%	9.20×	1 in 14	1 in 1.80	1 in 4.23	0.07× base	Simulate
Foreman Normal	Boosted spin	4.00×	96.50%	3.86×	every round	–	–	0.14× base	Simulate
Foreman Hard	Boosted spin	8.00×	96.50%	7.72×	every round	–	–	0.28× base	Simulate
Slot Normal	Boosted spin	8.00×	96.50%	38×	1 in 29	1 in 1.07	1 in 3.30	0.28× base	Simulate
Foreman Expert	Boosted spin	14×	96.50%	14×	every round	–	–	0.49× base	Simulate
Slot Hard	Bonus buy	20×	96.50%	331×	1 in 93	1 in 1.11	1 in 5.82	0.70× base	Simulate
Slot Expert	Bonus buy	50×	96.46%	10,011×	1 in 1,126	1 in 1.21	1 in 13	1.77× base	Simulate

Work out the cost of Tower Stack 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
v24	96.500%	Active

Frequently asked

What is the RTP of Tower Stack?

Base spins return 96.50% of the amount wagered over the long run, from the published outcome table for version 24. Its bonus buys return between 96.46% and 96.50%.

What is the max win in Tower Stack and how likely is it?

The top payout is 10,011× the base bet. On a base spin the top payout of 1.29× lands 1 in 1.34 spins. In the Slot Hard buy (20×) 331× lands 1 in 93 buys.

Does Tower Stack have a bonus buy, and what does it cost?

Yes, 2 buy modes. Slot Hard: 20× the base bet, 96.50% RTP, an expected cost of 0.70× the base bet per buy. Slot Expert: 50× the base bet, 96.46% RTP, an expected cost of 1.77× the base bet per buy.

Is Tower Stack high or low volatility?

Low. Its base-mode standard deviation is 1.9× 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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