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: Easy Get Stars Unlock Girls
Numpad 2: Quick Remove and Destroy Clothes
Numpad 3: Unlimited Lives
Numpad 4: Invincible
Numpad 1: Easy Get Stars Unlock Girls - enter HD Mode, toggle on, then leave then come back and more girls are unlocked. Repeat to unlock them all.
Numpad 2: Quick Remove and Destroy Clothes - you must have first shot some clothing that has the red HP value shown. Toggle this on and most clothing with HP will destroy instantly.
Numpad 3: Unlimited Lives - you need to have died once. Toggle on and you have unlimited lives.
Numpad 4: Invincible - you need to have taken damage at least once. Toggle on and nothing causes you harm.
Unlock more trainer options including updates from here - FLAT JUSTICE Trainer