So after a little working with Forum_Account's pixel movement demo and using it on my Isometric game (which it works great for) I started playing with his sidescroller versions and thought of some games that could be made, when I thought of an idea:

Have my normal part of the game like Im working on. Just a normal world with fighting, missions, etc. But also have an Arena (no new idea) but

This Arena will actually be a separate game that you get linked to from the original game. And it would be a side-scroller battle arena kinda like super smash brothers for players to battle their character they developed in the main game against other players