Megaways titles decide the reel heights on every spin, and that includes the spin that opens a purchased bonus, so two buys of the same game can start with 324 ways or with the full 117649. Some versions let you pick a guaranteed reel setup for a higher price. The Megaways section on https://thebonusbuyslots.com lists which games randomise the opening configuration and which lock it, along with the price gap between the two options. A cheap buy with a bad reel roll tends to end quickly.
