During the game, press the [~] (tilde) key to bring up the console, where you enter:
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tank.ammo – endless shells
tank.activate – tank debug interface.
tank.carsteering – set to 1 to use car steering (default = 0)
tank.easydriving – set to 1 to use easy driving mode (default = 0)
tank.immortal – tank mortality (sp only)
tank.speed – tank speed factor (sp only)
thunder – on / off / debug_create