Ultimate Robotnik Duels is a fangame in the Sonic the Hedgehog Series released on Newgrounds on 12th January 2006.
Playable Characters[]
- Sonic
- Robotnik
- Knuckles
- Tails
- "Silver" Sonic
- "Mecha" Sonic
- Amy
- Shadow
- Rouge
- Vector
- Mario
- Raiden
- M.S. Alien
- Cannon Head