A top-down survival duel. You’re pinned at the center of the arena while a horde of zombies pours in from the edges. Your rival survivor is doing the same on their side of the match — you’re racing to outscore them before the 90-second clock runs out. The twist is the merge mechanic: killing a zombie doesn’t always remove it from the field. Below max tier, it fuses into another zombie of the same type, upgrading it into something bigger, slower, tankier, and worth more points. Only the top-tier Colossus (Lv 5) dies for good. The better you play, the more dangerous the horde becomes — but also the more points you can farm.