Merge Survivor: Zombie Defense is an Android game developed by 1GAMES set in a world ravaged by a deadly virus, leading to a zombie apocalypse. In this survival game, players must collaborate with diverse survivors like carpenters, firefighters, police officers, bikers, and nurses to navigate through supermarkets, terminals, airports, and cities to ensure their survival. The gameplay involves merging survivors on a board to create stronger characters and strategic defense lines to fend off zombie attacks.

The game features simple merge mechanics where players merge three or more survivors to strengthen their team. Additionally, players can merge supplies to gain special abilities that aid in survival. Strategic placement of survivors and defense structures is crucial as zombies attack in various ways, requiring players to continuously recruit and empower survivors to protect their group.