Activating this trainer

If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options

# Player 
     NumPad1: Unlimited Health
     NumPad2: Unlimited Stamina
     NumPad3: Unlimited Essence
     NumPad4: Unlimited Oxygen

# Enemies 
     NumPad5: Weak Enemies

# Movement 
     NumPad6: Super Speed
     NumPad7: Super Jump

# Inventory 
     NumPad8: Mega Carry Capacity
     NumPad9: Set Selected Item to 99 Amount

# Gameplay 
     Multiply: Game Speed

Editor Options

# Currency 
     Gold

# Progression 
     Experience

# Mouse Over Inventory Item 
     Amount

Notes

Set Selected Item to 99 Amount:
Click Item or mouse over it, then press this key to set it 99 of that item.  You may have to leave inventory and come back to see it has changed.