ARK Plan is a free Android game that uniquely blends tower defense strategy with RPG elements and roguelike survival mechanics, set against a sci-fi apocalyptic backdrop. Players assume the role of the 'Professor,' leading a group of Settlers—mutated beings with special abilities—through perilous terrains to uncover clues and defeat parasitic foes threatening their world.

The game features over 60 Settlers across seven different classes, allowing for diverse team compositions tailored to various battlefields. Players can upgrade, evolve, and enhance their Settlers while engaging in challenging scenarios filled with bosses and difficult dungeons. The gacha system introduces an element of surprise with rare Settlers and gear, while new players are welcomed with numerous rewards to kickstart their adventure in this engaging anime-inspired universe.