Boulder Bucks Slot by Light & Wonder

The headline trick here is the UPick Free Spins Bonus, and it makes Boulder Bucks more interesting than its caveman wrapping suggests. Land three Boulder Bucks scatters on reels 1, 3 and 5 and you do not just get free spins. You get 1, 2 or 3 selections, and each selection lets you pick one of three different free-spin variants. Play it, then decide to collect what you won or reject the result and try a different variant on the next selection. Each variant can only be used once per bonus entry.

The three variants matter because the wild behaves completely differently in each. Mammoth Spins runs on snowy reels and gives you 20 spins of full-reel expanding wilds. Pterodactyl Spins drops you to 10 spins on sky-themed reels, but every symbol to the LEFT of a landing wild also turns wild. Sabre-Toothed Tiger Spins is the short, mean one. Just 6 spins, desert-themed reels, but the wilds expand AND stay persistent on the grid for the rest of the round. You are essentially choosing your own risk-reward shape every bonus entry, and the math behind each variant is genuinely different.

Wilds appear only on reels 2, 3 and 4 in both the base game and free spins, and they substitute for everything except the Boulder Bucks scatter and the Egg Pick Me icon. Those eggs are the secondary feature. Land them on the middle three reels and you trigger a small picker that hands out either a stake multiplier or a free pass straight into the UPick bonus.

There is also a Big Bet mode at $20 or $30 a pop, five linked spins paid at the end. It runs at the top 98% RTP version and unlocks a Boulder Smash assist. If two scatters land but the third reel misses, you get a Pick Me on the missing reel for a shot at the bonus anyway. That assist alone explains why Big Bet exists as a separate offer rather than just a bet step.

Visually, it is a chunky stone-age cartoon. 3D-rendered royals carved from wood and rock, a club-wielding caveman and a fur-clad cavewoman as premium symbols, plus a striped dinosaur and its egg. Warm browns and stone greys with pops of orange and tropical green, stone-tablet UI panels, and tropical foliage running down either side of the grid.