Gravity is an idea by X5163x.. The grid appears to stretch in the direction of the gravity. Tanks, bullets, drones, guardians, and dominators all have their own gravity well. The gravity allows you to deform the spawn zone, move dominators, cause baby tanks to suicide into you, and even create a 'shield' of bullets to protect you!
Now when your level is maxed out, your points don't just become a bounty on your tank. Instead, the points go to work by having everyone stay farther and farther away from you lest they crash into you and die with a violent death.
Arrows are an option before spawning. When this option is turned on, arrows will appear in the grid's squares and on tanks showing which way gravity influences them.