You don't get picked up by wind if you fall down one of the holes around the lighthouse.There are fewer floating islands around the 1-Up box near the end of the Act than in the final.There is an extra spring added while climbing the large island.Three '?'-ring boxes are missing behind the large island near the lighthouse.No Kiki in a tree next to the second spike wall.The whale and its chase section is completely missing.The checkpoint before the whale chase is placed right after the second loop, rather than just before the chase itself.There are extra dash panels present in the small area Sonic runs through after the jump ramp.There is a Kiki instead of a checkpoint after the jump ramp.No item box around the back of the island with the jump ramp.

There are extra Rhinotanks before the jump ramp.

It also has a very different camera angle than the one in the final: There's also only one spring used to get Sonic back up to the bridge before the loop in the final, there's two. No swinging spike ball in the middle of the area after the springs, either.

No rope barriers on the platforms after the springs.

Only four springs crossing under the bridge at the beginning instead of five.

Two Rhinotanks near the bridge instead of one.

There are no item boxes behind the starting point.

When he lands, the camera angle is different: Sonic starts in midair directly above his normal starting point.They have no lighting or textures and appear to have been designed to test the engine and physics, among other elements. Three rough test stages can be found in the game (labelled 'PRACTICE' in the level select) that were removed from the final and replaced with Amy's Hedgehog Hammer minigame.

Sonic adventure autodemo