Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad2: One Hit Kills
NumPad3: Add Coin
NumPad4: Refill Super Meter
NumPad5: Complete Next Level With A Grade
NumPad6: Complete Next Platforming Level With Pacific Grade
Invincible: Nothing will hurt you, not even falling outside of level.
One Hit Kills: While active you kill most enemies with a single hit.
Complete Level: On map press hotkey and your next level is completed. Open menu and click on 'Worlds' to see it is.
Unlock more trainer options including updates from here - Cuphead Trainer