To unlock Gooigi requires you to play through the Story for about 2 hours (depending how fast you go) and finish the Mission to get Professor E. Gadd his Briefcase back to him. Then the Pause Menu will display an option for Co-Op to play through the game in Multiplayer
How to Unlock Sonic –
- It took almost 6 hours to finish the game, but completing Worlds 1 – 8 is all that’s required to unlock Classic Sonic the Hedgehog.
What He Does in the Game –
- Instead of a Red Monkey Capsule, Sonic has a Blue Capsule.
- All Bananas change to Rings.
- Has his Running, Continue, Idle Animations from Genesis games
- 1UP changes to Sonic’s Face
- Sonic Mania Background Music
After 8 Worlds, we make it to the Final Boss of this game. Alongside unlocking Sonic the Hedgehog and a few more sneaky secrets.
Out of all the levels, Stage 5 in WOrld 6 was by far the worst. It took me over 30 minutes to complete thanks to pure luck and jumping over these obstacles.