What will I build?

I have five years of experience with Unreal 4, been digging deep into the source code and frameworks especially physics and multiplayer.

I want to create a ‘session-based game’ that can be self-sustained and played by parties of friends like ‘smash bros’ and ‘Mario Kart’, but with an online component.

The main challenge I think is to manage the cheat hacks that might pop up and disrupt the game.