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Alright, this is probably something everybody knows how to do, but I'm going to post it anyways.

This guide assumes you have already merged the two GHZ files to make a single file (In this case, it should be 8x8GHZ.bin), this is actually a really easy thing to do.


First, load _inc/Main level load blocks.asm

You should see something like:

	dc.l Nem_GHZ_2nd+$4000000
	dc.l Blk16_GHZ+$5000000
	dc.l Blk256_GHZ

Change it into:

	dc.l Nem_GHZ+$4000000  ;changed from Nem_GHZ_2nd
	dc.l Blk16_GHZ+$5000000
	dc.l Blk256_GHZ

Next, open sonic1.asm and look for:

Blk16_GHZ:	incbin	map16\ghz.bin
		even
Nem_GHZ_1st:	incbin	artnem\8x8ghz1.bin; Now only title screen and ending use this.
			even 
Nem_GHZ_2nd:	incbin	artnem\8x8ghz2.bin; Title Screen and ending only.
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even
Blk16_LZ:	incbin	map16\lz.bin
		even

add this above Nem_GHZ_1st::

Nem_GHZ:	incbin	artnem\8x8ghz.bin	 ; New GHZ file.
				even

It should look like:

Blk16_GHZ:	incbin	map16\ghz.bin
		even
Nem_GHZ:	incbin	artnem\8x8ghz.bin	 ; New GHZ file.
				even
Nem_GHZ_1st:	incbin	artnem\8x8ghz1.bin; Now only title screen uses this.
			even 
Nem_GHZ_2nd:	incbin	artnem\8x8ghz2.bin; Title Screen only.
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even
Blk16_LZ:	incbin	map16\lz.bin
		even

Next, go to _inc/Pattern load cues.asm and find:

PLC_GHZ:	dc.w $B
		dc.l Nem_GHZ_1st; GHZ main patterns
		dc.w 0
		dc.l Nem_GHZ_2nd; GHZ secondary	patterns
		dc.w $39A0

Change Nem_GHZ_1st into Nem_GHZ and remove Nem_GHZ_2nd. Next, you have to change $B into $A so it knows how many files to load.
You code should look like this.

PLC_GHZ:	dc.w $A
		dc.l Nem_GHZ; GHZ main patterns
		dc.w 0

Load up your rom and it should load Correctly. You won't be able to tell if it worked or not unless you edit the art.

Also, If you're going to be editing the art, it's best that you make a seperate file for the title screen.
To do this, open sonic1.asm and look for Title_LoadText: and scroll down until you see:

		lea	(Blk16_GHZ).l,a0; load	GHZ 16x16 mappings
		move.w	#0,d0
		bsr.w	EniDec
		lea	(Blk256_GHZ).l,a0; load GHZ 256x256 mappings

change it into:

		lea	(Blk16_title).l,a0; load title 16x16 mappings
		move.w	#0,d0
		bsr.w	EniDec
		lea	(Blk256_title).l,a0; load title 256x256 mappings

Now scroll down a little more to:

lea	(Nem_GHZ_1st).l,a0; load GHZ patterns

change it into:

lea	(Nem_title).l,a0; load title patterns

Now go to Blk16_GHZ and you should see:

Blk16_GHZ:	incbin	map16\ghz.bin
		even
Nem_GHZ:	incbin	artnem\8x8ghz.bin; GHZ primary patterns
		even
Nem_GHZ_1st:	incbin	artnem\8x8ghz1.bin; GHZ primary patterns
		even
Nem_GHZ_2nd:	incbin	artnem\8x8ghz2.bin; GHZ secondary patterns
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even

Copy Blk16_GHZ: and BLk256_GHZ: and past them both above Blk16_GHZ:.

Blk16_GHZ:	incbin	map16\ghz.bin
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even
Blk16_GHZ:	incbin	map16\ghz.bin
		even
Nem_GHZ:	incbin	artnem\8x8ghz.bin; GHZ primary patterns
		even
Nem_GHZ_1st:	incbin	artnem\8x8ghz1.bin; GHZ primary patterns
		even
Nem_GHZ_2nd:	incbin	artnem\8x8ghz2.bin; GHZ secondary patterns
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even

Change it so it looks like this:

Blk16_title:	incbin	map16\title.bin
		even
Blk256_title:	incbin	map256\title.bin
		even
Blk16_GHZ:	incbin	map16\ghz.bin
		even
Nem_GHZ:	incbin	artnem\8x8ghz.bin; GHZ primary patterns
		even
Nem_GHZ_1st:	incbin	artnem\8x8ghz1.bin; GHZ primary patterns
		even
Nem_GHZ_2nd:	incbin	artnem\8x8ghz2.bin; GHZ secondary patterns
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even

Then add:

Nem_title:	incbin	artnem\8x8title.bin
		even

Add that right above Blk16_title:.
You should have:

Nem_title:	incbin	artnem\8x8title.bin
		even
Blk16_title:	incbin	map16\title.bin
		even
Blk256_title:	incbin	map256\title.bin
		even
Blk16_GHZ:	incbin	map16\ghz.bin
		even
Nem_GHZ:	incbin	artnem\8x8ghz.bin; GHZ primary patterns
		even
Nem_GHZ_1st:	incbin	artnem\8x8ghz1.bin; GHZ primary patterns
		even
Nem_GHZ_2nd:	incbin	artnem\8x8ghz2.bin; GHZ secondary patterns
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even

Now you have to add those files. Go to artnem and copy 8x8ghz1.bin and rename it into 8x8title.bin
Then, go to map16 and copy ghz.bin and rename that into title.bin. Do the same thing for map256.

If you did it correct, congratulations! Your ending background might get messed up if you edit GHZ's art, but this guide should've given you the basic idea of how to fix that.

This is a hack I started on a few days ago. All of Sonic's art is replaced by Mr. Needlemouse. I don't actually plan to add anything else to the game, since this was only meant to be a sprite hack, that, and my hacking skills flat out suck.


Funny looking title screen.


Mr. Needlemouse in greenhill.


End of Spring Yard.


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