The Sega logo does not appear when booting up the game.

Bubbles are loaded incorrectly from the VRAM.

On the other hand, the monitors were programmed with the correct 1-Up sound. Game Genie code XCOT-AAC4 will cause the correct tune to play. This is because sound bank 88 (which was the 1-Up sound in the Nick Arcade prototype) has since been overwritten and not edited to play the correct sound. Upon collecting 100 Rings, the game will play Death Egg Zone's BGM instead of the usual 1-Up sound.

A unique bug is present in this prototype.

Special Stages are still not present, although the music is.When Sonic gets out of the water, the Emerald Hill music begins. The underwater countdown music uses the Level Select theme.Any zone with water will be glitched when playing in two-player mode, as the game loads the graphics incorrectly.As with the Nick Arcade prototype, the Spin Dash is still a work-in-progress, as Sonic and Tails can only charge it up once the sound for when Sonic spins in the original Sonic the Hedgehog is still heard due to there not yet being a specific sound effect for the Spin Dash.If player one completes a level, Tails can be controlled if Sonic is off-screen.If he dies, he drops back in from the top of the screen and immediately goes into a roll when he hits the ground because he cannot fly yet. Tails loses the player's rings when he is hit.

The AI is much simpler it only follows Sonic and does not try to keep up. Also, Tails cannot complete a level on his own, since the game only loads the goal sign when Sonic approaches it. That is, the second player is able to control Tails, except he will also follow Sonic.

At this point, Tails is still interdependent.

Casino night zone extended