What about an open/close button, for when you want people to come or not to. Like opening up a level when you want them to come and close it when you want to edit it secretly or something!
Very few changes need to be added.
-A few more weapons, wheels, hulls.
-Maybe some upgrades to the weapons.
-Changable/buyable turrets on bases.
-Retreat and select all tanks button.
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