Undead Invasion is a pixel-art roguelike zombie survival game where you play as a lone survivor defending against escalating waves of the undead. Each day brings a new, larger, and faster horde — fight them off with firearms, melee weapons, and explosives, then spend the cash you earn on upgrades before the next wave hits. The shop offers up to three items per round, including crowbars, M1911 pistols, Glock 17s, health packs, barricades, and roadblocks. There are no checkpoints: when you die, you lose everything and start over from day 1. Controls are simple — arrow keys to move, mouse click to attack, Q to switch weapons, E for knife, R to reload, spacebar to kick, and numpad 1 to throw bombs — but surviving the later days demands sharp positioning, smart loadout choices, and knowing when to fortify your defenses. The game also features a Playground mode for experimentation and a global leaderboard for chasing high scores. Built with Unity WebGL, it runs directly in your browser with no downloads required.