Why it is on the list
Gates of Olympus is the title the 1000 and 2500 editions grew from, and the one with the most modest ceiling of the three. Symbols pay anywhere on the screen across six tumbling reels: by the studio's own description, landing 8 to 30 matching symbols wins up to 50×, and winning symbols clear so new ones can fall in. What sets it apart from Sweet Bonanza is that multiplier symbols, worth up to 500×, can land in the base game as well as in the free spins, so an ordinary spin has a top end of its own.
How it plays
From Pragmatic's game page: four or more scatter symbols trigger the bonus game with 15 free spins. During the feature, whenever a multiplier symbol lands on a winning spin its value is added to a running total multiplier, and that total is applied to the win. Because the total carries through the round, the later free spins are worth more than the early ones when multipliers have already landed. The base game plays the same tumbles without the running total, which keeps it quick and gives every spin a chance at a multiplied win.
The maths
One published return on Pragmatic's game page: 96.50%. The studio does not state there whether lower configurations are licensed, so the paytable in the game is the only check on the build you are playing. Volatility is rated very high, and the max win is 5,000× the bet; the studio's game page lists the RTP but not those two figures, so the in-game rules are where to confirm them. Very high volatility against a 5,000× cap means the dry runs are long relative to the ceiling.
Who it is for
Players who want the classic version of the format and accept that the ceiling is the lowest of the family. If 5,000× feels short for the variance, Gates of Olympus 1000, also on this list, is the same studio's sequel with a 15,000× max win at the same published 96.5% return. For the pure tumble experience without the base-game multipliers, Sweet Bonanza is the alternative.