I think everyone agrees upon Rock Tunnel.Besides that, I'd say the only thing I think the game could have improved on was the general flow. There are many moments where the player has to guess where to go and what to do, and many times younger children get stuck (This is why I think most non-veterans refuse to play these games). A prime example would be the guards posted around Saffron City. The soda machines? Really? Come on, guys.