Firstly, I would like to say not Minecraft. Here is the list of boxes to tick:
- fun to play
- fun for audience to watch (i.e. Not Battlefield or CoD)
- solo not co-op
- re-play value (such as Binding of Isaac, except that game is a bit dated)
- original yet famous enough to attract attention
- NOT something 13/14/15 year olds would watch (I don't want an immature audience)
Optional:
- something that makes commentating easier
- not a puzzle game (that will make for dreadful commentary)