Port Sonic 2 Level Select to Sonic 1

Guide by DelayHacks. This is my first guide. You need to download level select by Esrael:

Download Sonic 2 Level Select in Sonic 1 File: s2menu.rar (29 kB) (info)

and extract him to disassembly.

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Getting Level select in game

After download and add to disassembly go to "sonic1.asm" and go to end and you see this

; end of 'ROM'
EndOfRom:


		END

add this line before "; end of 'ROM'"

         include 's2_menu.asm' ; Sonic 2 Level Select

now go to

Title_ChkLevSel:
		tst.b	($FFFFFFE0).w		; check	if level select	code is	on
		beq.w	PlayLevel		; if not, play level
		btst	#iA,(Joypad|Held).w	; check if A is held
		beq.w	PlayLevel		; if not, play level
		moveq	#2,d0
		bsr.w	PalLoad2		; load level select pallet
		lea	($FFFFCC00).w,a1
		moveq	#0,d0
		move.w	#$DF,d1

and replace with this

Title_ChkLevSel:
		tst.b	($FFFFFFE0).w		; check	if level select	code is	on
		beq.w	PlayLevel		; if not, play level
		btst	#iA,(Joypad|Held).w	; check if A is held
		beq.w	PlayLevel		; if not, play level
		jmp     Level_Select_Menu ; if yes, goto Sonic 2 level select	
		moveq	#2,d0
		lea	($FFFFCC00).w,a1
		moveq	#0,d0
		move.w	#$DF,d1

Thats all. All permissions for this level select code goes to Esrael.

	Result