Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
Trainer Options:
NumPad1: Infinite Health
NumPad2: Unlimited Lives
NumPad3: Change Sapphire By 5
NumPad4: Change Ruby By 5
NumPad5: Change Gold By 5
NumPad6: Change Topaze By 5
NumPad7: Change Key By 5
NumPad8: Change BossKey By 5