Battletoads for Gameboy. I just wanted to hear more of that slamming soundtrack, but the flying level beat me…
EDIT Oh snipes I misread the post, I thought they were asking for games that were too hard
I would have loved for Pokemon Red/Blue to have had some infinite endgame. It was already a big game so no harm done, bu I would have loved to have more use for my overpowered pokemon
Thanks for informing me about Radical Red!