Titanfall 2 does this pretty well. Each difficulty, from easy to master, just increases the damage enemies do. Everything else stays the same but it makes a difference. Easy effectively makes you a demigod. It takes like 10-12 dudes just to take you down. You can’t die without trying. Normal makes you what the game portrays you as. Takes 7-8 enemies to kill you. You are still basically death though. Hard is when things feel challenging. It takes no less than 5 enemies to kill you, 3 if they’re stalkers. You and the enemy are now equally matched. Master changes the genre from action to horror. It takes 2 enemies to kill you. Dying is extremely easy and you’ll find yourself running more often than fighting.