CombatZone.io is a 2D multiplayer tank game. Destroy targets to gain experience points and level up. One skill point is received for every level up. The upgrades in CombatZone.io are similar to diep, and overall the play can be seen as similar. In CombatZone.io, you move with WASD and shoot with the mouse. Be careful of towers and soldiers that spawn from towers, they will shoot at you.