Hello, I haven't played the game yet, but I saw that at one point there is a boss fight with silver mecha and metal sonic(s), but not all of them activate, is it possible to fight all of em in one fight?
Yes, as of version 1.23.
You have to clear the game and get a good ending at least once.
After that, you have to find a hidden button in Gene Gadget 1 (HINT: it's somewhere near the boss room) and press it before the battle.
If you did everything correctly, the button will flash red.
Have fun!
