Join Sonic and his friend, Knuckles in a new adventure with a lot of new enemies and challenging levels with this cool ROM hack - Sonic 2 Millennium Edition! Sonic 2 Millennium Edition is an arcade adventure platformer game released for the SEGA platform. This game is a ROM hack for the Sonic the Hedgehog 2 game released in 2002. The game features many new maps, awesome sprites, and more challenging levels. The game's original gameplay and its original storyline were not changed nor modified. This game lets you play as either Sonic or Knuckles and go through more challenging levels that will play tricks with your mind and test it. Can you overcome all these tricky levels? Can you beat the entire game and reach your goals? Good luck!