Upgrade your vehicle to fend off every wave of enemy attacks! The more gold you have to accumulate to upgrade your vehicles, the higher the level, ..

Upgrade your vehicle to fend off every wave of enemy attacks! The more gold you have to accumulate to upgrade your vehicles, the higher the level, the more revenue you generate, and the more vehicles you can build. Here are some tasks for you to complete. Come and have a try!Tap to play