S.A.C.K. - Survive and Choose Knowledge

Core gameplay and premise

S.A.C.K. - Survive and Choose Knowledge is a bullet heaven tower defense game for PC. Players take on the role of a living backpack on an abstract moon surface where they aim to survive against various alien monsters. The game involves adapting, deploying defenses, and leveling up to become stronger.

Combat and weapons

You can customize your loadout with up to six different weapons and towers in your inventory. The game allows for flexible tower deployment, meaning you can choose how to place your unlocked towers on the map, up to a defined limit. This flexibility lets you develop strategies based on your current tower types, whether you focus on heavy towers, mobile firepower, or a mix of both.