In one of my old videos I combined the Death Egg Robot fight and the Silver Sonic fight into one single boss fight. A lot of you guys didn't like how I did it, so I'm doing it again!

Original video:    • Death Egg Zone hard mode  

I set up the boss fight with Debug Mode. Debug mode is a hidden game mode designed for the developers. This game mode allows the player to move anywhere around the act or zone, and it also allow the player to spawn new items such as extra rings or spikes. To activate debug mode, start a "No Save" file. When the Sega logo pops up, press all the letters in order. When the black screen with text pops up, put 2 fingers on the screen at the same time, and hold you fingers there. This will take you to the level select screen, where you can immediately select any act of any zone without having to complete previous acts. On the bottom of the Level select screen is a sound test. enter the tracks 1, 9, 9, 2, 1, 1, 2, 4. If you entered those tracks correctly, you should hear a ring sound. After this, simply choose one of the stages and you can now play around with debug mode! To find out how I set up this boss fight specifically, watch the original video I made.