Sonic 2 Adventure Edition is an attempt to adapt some elements of Sonic Adventure to Sonic 2, like Sonic 2 Secret Rings Edition, but more focused.
To that end, I have taken Sonic's moveset from Sonic 2 Adventure Control, and added several other things:
- A separate character select screen.
- Two gameplay modes: Adventure, where you play through the levels in order, and Trial, where you select a single stage.
- The HUD has been redesigned, removing the score counter, expanding the minute counter to two digits, adding a centisecond counter, replacing the "RINGS" text with an image of a Ring, and removing the character's name from the life counter.
- Rather than having the first act end with a signpost, you will instead be transported directly to the second act, making them function as one large level.
- Sky Chase, Wing Fortress and Death Egg now have score tallies (SCZ and DEZ upon completing the level, WFZ upon defeating the boss).
- Each level (barring Sky Chase and Death Egg) have three missions to complete: Level C requires you to complete the level, Level B requires you to complete the level with 50 Rings, and Level A requires you to complete the level within a certain time. Completing these objectives will earn you an Emblem.
- Your collected Emblems, Best Score, Best Time, and Most Rings are saved and can be viewed in the Trial mode level select.
- Clearing Emerald Hill Zone for the first time unlocks Trial mode and Tails as an AI partner.
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