Birthday! Slot by ELK Studios

Five guest characters from other ELK games drop in at random, each one bringing a different respin variant called Happy Spins. No scatters to collect, no bonus meter to fill. A doorbell rings, a guest walks in, and their feature starts. Anne Bonny keeps respinning until you hit a win of at least 20x your bet. Mr Lake respins until a 5-of-a-kind fills all reels. The Matador from Wild Toro locks onto a symbol and respins until it forms a win. The Camel keeps going until 3, 4, or 5 total wins land. Electric Sam picks a symbol and collects as many as possible before the streak dies. Every variant guarantees a payout of some kind, though the size depends entirely on which guest and how long their condition takes to resolve.

Maggie triggers 10 free spins when she appears. If Happy Spins activate during those free spins, the counter freezes until the respins finish, then picks back up. Wild overlays add another layer on top of both modes. Sticky Wilds lock 3 random positions for the duration of any active feature, and Walking Wilds place 3 wilds that shift left one reel per spin until they fall off. The combination of frozen free spins, guaranteed respins, and persistent wilds across the grid is where the payouts concentrate. Getting all three to intersect is the hard part.

The 178 connecting paylines are unusual - not a number you see on other grids. A birthday cake symbol is the wild. Between spins, random celebrity birthday announcements pop up, which is a weird novelty touch that somehow fits the neon nightclub party setting. The base game itself runs dry, with long stretches between doorbell rings. But when two or three features chain inside the same window, the action compresses fast.