[Orengefox]

Something I never noticed until just today.






These screenshots from off a magazine of what might be prototype Sky High Zone uses the same platforms, palette and background you see in the prototype Green Hills Zone.

There's a chance we might find this in the ROM.

This post has been edited by Orengefox: 20 August 2014 - 07:21 PM

[Master Emerald]

So there seems to be only one song indexed, the one that plays through the demo at ID #83 You can check this going to Addres DE03 and changing the value. It has some SFX unused in the demo too!

[MarkeyJester]

Download

Get exploring retro! Demo time is now removed, and you now have control over Sonic.

Edit 02: HAH,. there are spikes and functional springs on the level!

This post has been edited by MarkeyJester: 20 August 2014 - 07:58 PM

[Master Emerald]

Jeez you're fast! Thanks!

[Overlord]

Holy crap, awesome! Had a quick play around, there is indeed workable springs and other things to play with. Next up, the other levels? =P

[Tanks]

MarkeyJester, on 20 August 2014 - 07:50 PM, said:

Download

Get exploring retro! Demo time is now removed, and you now have control over Sonic.

Edit 02: HAH,. there are spikes and functional springs on the level!

Walked left at the start and suddenly everything stopped functioning :V

Edit: hahah reaching the end and continuing to the right produces the same effect. its like the collision detaches from the sprites.

This post has been edited by Tanks: 20 August 2014 - 08:09 PM

[Master Emerald]

Heey!

[Yuski]

To make Sonic roll, you don't need to run then press down, just hold down and press left or right and he'll spin.

Really buggy!

[MarkeyJester]

Here's one for you, using that ROM I linked, the bytes at offset 054B and 0550 decide the zone/act, by default they are set to 00 and 00 (Zone 0 act 0). Change them so see the other levels.

Here's a tool to help those who don't use hexadecimal editors but wish to take a look at the other acts/zones. Just drag and drop the autodemo ROM onto the application (On the file, not the console window) and then type in the Zone and Act ID's to patch onto the ROM.

This post has been edited by MarkeyJester: 20 August 2014 - 08:45 PM

[You-Are-Pwned]

MarkeyJester, on 20 August 2014 - 08:12 PM, said:

Here's one for you, using that ROM I linked, the bytes at offset 054B and 0550 decide the zone/act, by default they are set to 00 and 00 (Zone 0 act 0). Change them so see the other levels.

How did you discover those thing so fast? I'm interested in what kind of debugger of SMS or Z80 you use, if any.

EDIT: It looks like those are the values for all 3 levels: (Zone 0 Act 0), (Zone 1 Act 2) and (Zone 3 Act 1) respectively.
First level:

ROM:054A                 ld      a, 0
ROM:054C                 ld      (byte_D287), a
ROM:054F                 ld      a, 0
ROM:0551                 ld      (byte_D288), a
ROM:0554                 call    sub_734

Second level:

ROM:05AA                 ld      a, 1
ROM:05AC                 ld      (byte_D287), a
ROM:05AF                 ld      a, 2
ROM:05B1                 ld      (byte_D288), a
ROM:05B4                 call    sub_734

Third level:

ROM:0602                 ld      a, 3
ROM:0604                 ld      (byte_D287), a
ROM:0607                 ld      a, 1
ROM:0609                 ld      (byte_D288), a
ROM:060C                 call    sub_734

This post has been edited by You-Are-Pwned: 20 August 2014 - 08:27 PM

[Master Emerald]

Holy shit

[You-Are-Pwned]

There seems to be more levels than just three though... A lot of them are unfinished.

[doc eggfan]

Master Emerald, on 20 August 2014 - 08:25 PM, said:

Holy shit

O_O

I remember finding those unused tiles wayback when. Nice to see them arranged as intended.

[DustArma]

The autodemo is so ridiculously broken, it makes Sonic Crackers look finished.

[Dark Sonic]

Wow what a mess, it's wonderful