Another thing to coinsider: what to do with VVZ1 Metal Sonic battle and VVZ2 boss, since their battles differ slightly depending on the time period (platforms move in different directions in VVZ1, the terrain allows to roll on the ceiling in VVZ2 future, but not in VVZ past). Adding a toggle for the time period seems... excessive.
Simply put, it's a mode in which the player faces all bosses and mini-bosses in order.
TBD if the mode should teleport the player from one level to another or use a unique map à la Egg Gauntlet (https://www.youtube.com/watch?v=TcejUa4c3mg).
Another thing to coinsider: what to do with VVZ1 Metal Sonic battle and VVZ2 boss, since their battles differ slightly depending on the time period (platforms move in different directions in VVZ1, the terrain allows to roll on the ceiling in VVZ2 future, but not in VVZ past). Adding a toggle for the time period seems... excessive.