Hardest Boss Battles #12 HD - Casino Night Robotnik
Robotnik's robot from Casino Night zone is on here solely for the fact that he was the first hard boss that I ever ran into as a kid. Sonic 2 was the very first game I ever played and Casino Night Zone was the farthest I could get for the longest time. When I finally did it I felt accomplished.
Remember this was a time before saving, when you lose you go back to the beginning. This game is also only a year older than me :D...:(