Boxguy Adventure 2

A Rom Hack of the 8-bit version of Sonic the Hedgehog for the Sega Master System that adds new levels and lets you play as Boxguy, features custom levels, graphical changes among other things.

After events of Boxguy Adventure and Boxguy's Puresabe Adventure. Boxguy decides to take vacation on South Island and has a good time until Dr. Robotnik decides to take over the robotize all of it. Sonic not around because of the events of Sonic Forces. So Boxguy goes to stop Robotnik.