Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Infinite Player Blocks Health
NumPad2: Disable AI
NumPad3: Change Level By 1
NumPad4: Change EXP By 5000
NumPad5: Change Money By 5000
Infinite Player Blocks Health: While active your vehicle cannot be destroyed.
Disable AI: While active the enemy stands still.
Level / EXP: First get some EXP by for example destroying a block. Then press hotkey or make your changes and get some EXP again.
Money: Press hotkey to add more.
Unlock more trainer options including updates from here - TerraTech Trainer