Sky Deck in the Sonic Adventure Autodemo.

By fixing the broken pointers that cause this stage to crash normally, it can become playable. This one is the most complete out of all the broken stages - it's only missing its BGM and some textures for the Aircraft enemy from Act 2.

Unlike Twinkle Park and Lost World, it's possible to beat this stage normally. While the object layout is a work in progress, the stage has a higher draw distance, so lights that aren't usually visible in the final game can be seen. The Egg Carrier background object for Act 3 is also used.

Unfortunately, this isn't the version filled with various background objects seen in early footage, it's a bit earlier. The decor objects exist, but the object layout is slightly older.

One of the main differences is how the huge cannons at the end of Acts 1 and 2 work. The Act 1 cannon is capable of destroying everything around it, whereas the final version can only destroy the straight platforms. However, it can only aim at the cylinders (which take 2 hits) if Sonic is somehow standing on top of them, so it still can't be seen normally. When it's destroyed, it throws Sonic upwards in a janky motion - this is deliberately done in its code, I assume as part of a transition to Act 2 that was scrapped.

The Act 2 cannon is a lot faster than its final counterpart. This, combined with the different shape of the rocket bases (and that fact that it has no collision so you'll fall through it if you miss) makes it quite difficult to catch.

In both Acts 1 and 2 the act transitions are handled by an object that goes unused in the final game - it's in front of the cannon in Act 1, and behind the one in Act 2.

Act 3 is pretty WIP: Everyone still has an early spawn only Tails has final, the sideways gravity section has a lot of issues and the falling objects make the stage laggy. They tried to put jump panels in the sideways part but Sonic can't land on them from that direction. Knuckles has the same layout as Tails, you can spawn the lever in but it doesn't do anything.

Credit to woofmute for the patch to restore the object editor:
https://gamebanana.com/mods/512594

Download as a mod via X-Hax's GitHub:
https://github.com/X-Hax/dreamcast-mods
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