Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
Numpad 1: Unlimited Health
Numpad 2: Unlimited Jumps
Numpad 3: Unlimited Oxygen
Numpad 4: Unlimited Energy
Numpad 5: Collect All Level Quills
Numpad 6: No Damage Mode
Numpad 1: Unlimited Health - toggle on to try and keep your health meter full.
Numpad 2: Unlimited Jumps - toggle on temporarily to allow you to jump over and over. If the screen becomes to shakey, or other problems, toggle back off. Leave off unless necessary to quickly reach areas.
Numpad 3: Unlimited Oxygen - you must first lose oxygen at least once. Toggle on for unlimited Oxygen.
Numpad 4: Unlimited Energy - you must first use energy at least once. Toggle on for unlimited Energy.
Numpad 5: Collect All Level Quills - this option will collect ALL the Quills for the current level you are on. The best way to use this is to collect ONE Quill in the level. Toggle this on, then the next Quill you collect you will have collected them all. You must collect at least one quill for this option to work. Also, note that in some cases if you have all the Quills, then when you collect more that are visible you will collect pages.
Numpad 6: No Damage Mode - in some cases, the health option will not protect you against certain damage. Toggle this on and almost all damage in the game is turned off. This also means that you cannot kill the enemy either. Only use this for difficult areas that you die on.
Unlock more trainer options including updates from here - Yooka-Laylee Trainer