This version of the game is also based on REV01, and is not simply an emulated rom - it uses rebuilt code, which allows the toggle-able features. Unlike most of the other re-releases, the version of the game included uses CD audio (like Sonic CD), allowing for enhanced sound.Skid marks appear when changing direction while running, much like in the other Sonic games.Easy and Normal modes, which reduce the difficulty of the game by different measures.

Turning on the Spin Dash makes spike damage happen like later Sonic games, rather than ignoring the invulnerability after taking damage. A toggle-able Spin Dash move present in the other Sonic games.If the camera is panned down at the moment the results screen is about to appear at the end of the first two Acts, the game may crash with an illegal instruction exception. This can be triggered in the first two acts of Labyrinth Zone. a bug causes the game to crash), the game will stop and print some basic information to the screen. In the event a 68000 exception occurs (e.g. The game contains a very basic error handler. C, C, C, C, Up, Down, Down, Down, Left, Right, hold A and press Start.C, C, Up, Down, Down, Down, Left, Right.As usual, they are entered on the title screen and can be combined by interpolating a D-Pad direction between them. When running on a Japanese console, there are separate codes for the pause options and the rest of the debug features. Pause Options: Press A to go back to the title screen, press B to enable slow motion and press C to enable frame advance.From there, press A to move forward one object, hold A and press C to move backward one object and press C to place the object. Placement Mode: Press B during gameplay.From here, you have access to a variety of things: After entering the code, press Start while holding A and continue holding A until Sonic is in the level. The main requirement for the code is pressing C twice before the final input of Right. There is 2 codes, the first one is Up, C, Down, C, Left, C, Right, C and the other one is C, C, Up, Down, Left, Right. 18 Currently missing/under construction.

Sonic 1 hud sprites