Invaders From The Planet Moolah Slot by Light & Wonder

Most slots gate their free plays behind scatters. Planet Moolah counts cascades instead. Every base-game win clears the symbols, drops the survivors, and pulls fresh icons in from above. String four of those cascade chains together on a single spin and the bonus opens at 7 free plays. Five chained cascades pay 10, six pay 15, seven pay 25, and any run of eight or more lands the top award of 50. A meter on the left rail tracks your cascade count in real time, so you can watch the next tier creep closer before the chain finally breaks.

The hook is that the math gives you a second route in. If a spin fizzles without hitting the chain threshold, the feature can still fire at the end of the round for a flat 7 free plays. It is a quiet consolation buried in the trigger logic, and it shows up often enough to matter. Inside the bonus the reels swap to an alternate set with extra wild-cow positions on reels 2 through 5, which is the whole reason cascade chains run longer there. Hit four more consecutive cascades during the feature and the same award schedule retriggers on top of whatever spins you have left.

The wilds are the alien cows themselves, sitting inside their UFO halos, and they only land on reels 2 to 5. Reel 1 never carries one, which is a quiet variance lever most players miss. The premium symbols are pure 2013 cartoon Americana: a pipe-smoking grandpa, a brown ranch dog, a blonde cowgirl, and a "MISSING" milk carton left behind by abducted cattle. Above the reels, five flying saucers hover over a country town with a sandy Planet Moolah looming on the right. The "JACKPOT" symbol sounds like a progressive but pays a flat 500x line for five of a kind, which is worth knowing before you chase it.