Originally Posted by Chojin
Every Zelda and Metroid game and almost every game with stats and upgradable weapons?
Only Zelda that comes to mind is Wind Waker, if only because you lose the sword. But most games "with stats and upgradable weapons" (and Metroid) scale the difficulty so that you're consistently challenged so that fighting Boss 1 at level 5 will be as hard as fighting boss 8 at level fourty.
At least, that's the ideal difficulty curve. And I don't think Metroid's ever harder in the beginning.