Difference between revisions of "Sonic the Hedgehog 2 (8-bit) AutoDemo/Hidden content"
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{{HiddenContent | {{HiddenContent | ||
| image1=Sonic2AutoDemo GG FreeMovement.png | | image1=Sonic2AutoDemo GG FreeMovement.png | ||
| − | | desc=Changing byte | + | | desc=Changing byte {{hex|0x0064}} to {{hex|02}} will enable the ability to move around a level freely. Once enabled, hold {{1}} and press the D-Pad in any direction during gameplay to move [[Sonic the Hedgehog|Sonic]] around.{{ref|https://tcrf.net/Proto:Sonic_the_Hedgehog_2_(Sega_Master_System,_Game_Gear)#General_Differences}} |
}} | }} | ||
| Line 10: | Line 10: | ||
{{UnusedTable|type=Art| | {{UnusedTable|type=Art| | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite LaughingSonic.png}} |
| desc=Sprites that depict [[Sonic the Hedgehog|Sonic]] laughing in a rather creepy manner. Purpose unknown. | | desc=Sprites that depict [[Sonic the Hedgehog|Sonic]] laughing in a rather creepy manner. Purpose unknown. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite HappyWaitingSonic.png}} |
| desc=A frame of Sonic's idle animation from the [[Master System]] version of ''[[Sonic the Hedgehog (8-bit)|Sonic 1]]'', but altered to make him look happy. | | desc=A frame of Sonic's idle animation from the [[Master System]] version of ''[[Sonic the Hedgehog (8-bit)|Sonic 1]]'', but altered to make him look happy. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite SkiddingSonic.png}} |
| desc=An early skidding animation, which looks closer to those from the [[Sonic the Hedgehog 2 (16-bit)|Mega Drive version]]. | | desc=An early skidding animation, which looks closer to those from the [[Sonic the Hedgehog 2 (16-bit)|Mega Drive version]]. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2SMSEarlyDeathSprite.png}} |
| desc=Sonic can't die in this prototype, so this death sprite goes unused. It is identical to the final's early death sprite, taken from the Master System version of ''Sonic 1''. | | desc=Sonic can't die in this prototype, so this death sprite goes unused. It is identical to the final's early death sprite, taken from the Master System version of ''Sonic 1''. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite Monitors.png}} |
| desc=No [[monitor]]s appear in any level, but graphics for them are loaded at the Sega/title screen. | | desc=No [[monitor]]s appear in any level, but graphics for them are loaded at the Sega/title screen. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite Switch.png}} |
| desc=These [[button]] sprites are located within the [[Under Ground Zone]] tileset, but aren't used in any Acts. | | desc=These [[button]] sprites are located within the [[Under Ground Zone]] tileset, but aren't used in any Acts. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite UGZSpikes.png}} |
| desc=Under Ground Zone only has downward-facing [[Spikes (obstacle)|spikes]] at this point, rendering these upward spikes unused. | | desc=Under Ground Zone only has downward-facing [[Spikes (obstacle)|spikes]] at this point, rendering these upward spikes unused. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite Explosion.png}} |
| desc=There's nothing that can explode in the AutoDemo, so the explosion tiles that are located within the number/icon sprites are never seen in action. | | desc=There's nothing that can explode in the AutoDemo, so the explosion tiles that are located within the number/icon sprites are never seen in action. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite Fragment.png|2}} |
| desc=Blocks can't be destroyed in the AutoDemo, leaving this fragment unused. | | desc=Blocks can't be destroyed in the AutoDemo, leaving this fragment unused. | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite SHZTrees.png}} |
| desc=The trees seen in the final [[Sky High Zone]] and in some prerelease screenshots are present in the ROM, but not actually used at this point.{{ref|{{LinkRetro|post=797603|title=Sonic Retro forum thread - (GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download; post by Master Emerald}}}} | | desc=The trees seen in the final [[Sky High Zone]] and in some prerelease screenshots are present in the ROM, but not actually used at this point.{{ref|{{LinkRetro|post=797603|title=Sonic Retro forum thread - (GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download; post by Master Emerald}}}} | ||
}} | }} | ||
{{UnusedRow | {{UnusedRow | ||
| − | | | + | | content={{SpriteImage|Sonic2AutoDemo GG Sprite TitleCardFont.png}} |
| desc=The 16x16 font from the unused level title cards (see below). Only 8 of the 41 characters get used. | | desc=The 16x16 font from the unused level title cards (see below). Only 8 of the 41 characters get used. | ||
}} | }} | ||
| Line 58: | Line 58: | ||
{{HiddenContent | {{HiddenContent | ||
| image1=Sonic2AutoDemo GG TitleCard.png | | image1=Sonic2AutoDemo GG TitleCard.png | ||
| − | | desc=Setting ROM address | + | | desc=Setting ROM address {{hex|0x2BA}} to {{hex|03}} will sometimes load an early title card on resets. It crashes to a black screen after two seconds.{{ref|{{LinkRetro|post=797151|title=Sonic Retro forum thread - (GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download; post by You-Are-Pwned}}}} |
}} | }} | ||
| Line 64: | Line 64: | ||
{{HiddenContent | {{HiddenContent | ||
| noimage=yes | | noimage=yes | ||
| − | | desc=Similar to other games developed by [[sega:Aspect|Aspect]], the game's build date can be located at ROM address | + | | desc=Similar to other games developed by [[sega:Aspect|Aspect]], the game's build date can be located at ROM address {{hex|$C0}}: |
<pre>MS SONIC¥THE¥HEDGEHOG.2 Ver0.00 1991/12/05 Aspect Co.,Ltd</pre> | <pre>MS SONIC¥THE¥HEDGEHOG.2 Ver0.00 1991/12/05 Aspect Co.,Ltd</pre> | ||
}} | }} | ||
Latest revision as of 18:25, 3 December 2022
- Back to: Sonic the Hedgehog 2 (8-bit) AutoDemo.
Free movement
Changing byte 0x0064 to 02 will enable the ability to move around a level freely. Once enabled, hold 
and press the D-Pad in any direction during gameplay to move Sonic around.[1]
Unused content
Art
| Art | Description |
|---|---|
| Sprites that depict Sonic laughing in a rather creepy manner. Purpose unknown. | |
| A frame of Sonic's idle animation from the Master System version of Sonic 1, but altered to make him look happy. | |
| An early skidding animation, which looks closer to those from the Mega Drive version. | |
| Sonic can't die in this prototype, so this death sprite goes unused. It is identical to the final's early death sprite, taken from the Master System version of Sonic 1. | |
| No monitors appear in any level, but graphics for them are loaded at the Sega/title screen. | |
| These button sprites are located within the Under Ground Zone tileset, but aren't used in any Acts. | |
| Under Ground Zone only has downward-facing spikes at this point, rendering these upward spikes unused. | |
| There's nothing that can explode in the AutoDemo, so the explosion tiles that are located within the number/icon sprites are never seen in action. | |
| Blocks can't be destroyed in the AutoDemo, leaving this fragment unused. | |
| The trees seen in the final Sky High Zone and in some prerelease screenshots are present in the ROM, but not actually used at this point.[2] | |
| The 16x16 font from the unused level title cards (see below). Only 8 of the 41 characters get used. |
Early title card
Setting ROM address 0x2BA to 03 will sometimes load an early title card on resets. It crashes to a black screen after two seconds.[3]
Build date
Similar to other games developed by Aspect, the game's build date can be located at ROM address $C0:
MS SONIC¥THE¥HEDGEHOG.2 Ver0.00 1991/12/05 Aspect Co.,Ltd
References
- ↑ The Cutting Room Floor: Proto:Sonic the Hedgehog 2 (Sega Master System, Game Gear)#General Differences
- ↑ [Sonic Retro forum thread - (GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download; post by Master Emerald
Sonic Retro forum thread - (GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download; post by Master Emerald] - ↑ [Sonic Retro forum thread - (GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download; post by You-Are-PwnedSonic Retro forum thread - (GG) Sonic 2 Auto Demo Prototype (1991-12-05) - Info & Download; post by You-Are-Pwned]
| Sonic the Hedgehog 2 (8-bit) AutoDemo, prototype version of Sonic the Hedgehog 2 (8-bit) | |
|---|---|
|
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