View source for Resize Levels in Sonic 2

{{GuideBy|lavagaming1}}

In Sonic 2, all acts reference an array which defines starting screen boundaries for the levels.
By editing this array, we can resize the initial level boundaries, so let's do that.
In s2.asm, search for "LevelSize:" You should see this:
<syntaxhighlight lang="asm">
; ===========================================================================
; ----------------------------------------------------------------------------
; LEVEL SIZE ARRAY

; This array defines the screen boundaries for each act in the game.
; ----------------------------------------------------------------------------                                     ;how long                                     ;is level;makeslev                                                ;up                                                       ;dawn
;				xstart	xend	ystart	yend	; ZID ; Zone
LevelSize: zoneOrderedTable 2,8	; WrdArr_LvlSize
	zoneTableEntry.w	$0,	$2FFF,	$0,	$669	; EHZ act 1
	zoneTableEntry.w	$0,	$2940,	$0,	$550	; EHZ act 2
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720	; EHZ act 3
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720	; wood zone
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720	; $03
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720
	zoneTableEntry.w	$0,	$2280,	-$100,	$800	; MTZ act 1
	zoneTableEntry.w	$0,	$1E80,	-$100,	$800	; MTZ act 2
	zoneTableEntry.w	$0,	$2A80,	-$100,	$800	; MTZ act 3
	zoneTableEntry.w	$0,	$3FFF,	-$100,	$800
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720	; WFZ
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720
	zoneTableEntry.w	$0,	$2800,	$0,	$720	; HTZ act 1
	zoneTableEntry.w	$0,	$3280,	$0,	$720	; HTZ act 2
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720	; hidden palce
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720	; $09
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720
	zoneTableEntry.w	$0,	$2F80,	$0,	$680	; OOZ act 1
	zoneTableEntry.w	$0,	$2D00,	$0,	$680	; OOZ act 2
	zoneTableEntry.w	$0,	$2380,	$3C0,	$720	; MCZ act 1
	zoneTableEntry.w	$0,	$3FFF,	$60,	$720	; MCZ act 2
	zoneTableEntry.w	$0,	$27A0,	$0,	$720	; CNZ act 1
	zoneTableEntry.w	$0,	$2A80,	$0,	$720	; CNZ act 2
	zoneTableEntry.w	$0,	$2780,	$0,	$720	; CPZ act 1
	zoneTableEntry.w	$0,	$2A80,	$0,	$720	; CPZ act 2
	zoneTableEntry.w	$0,	$1000,	$C8,	 $C8	; DEZ
	zoneTableEntry.w	$0,	$1000,  $C8,	 $C8
	zoneTableEntry.w	$0,	$3380,  $0,	$720	; ARZ act 1
	zoneTableEntry.w	$0,	$3FFF,	$180,	$710	; ARZ act 2
	zoneTableEntry.w	$0,	$3FFF,	$0,	$000	; SCZ
	zoneTableEntry.w	$0,	$3FFF,	$0,	$720
    zoneTableEnd

; ===========================================================================
</syntaxhighlight>
This is the array. Now, let me explain how this works:
X-Start: These are all $0 so that the screen boundaries for the level start at the start of the level. Make it a larger value if you want there to be hidden level geometry.

X-End: This is the end of the screen boundaries on the x-axis, usually at the end of the level. I'd suggest making it the current x-position of the signpost or egg-capsule plus $A0.

Y-Start: This is the top of the level, where the camera cuts off. This should be self-explanatory.

Y-End: This is where the death boundary will be at first. Adjust wisely.

These all reference X and Y coordinates in the level, respectively.
In Sonic 2, these are easily accessible in ASM format, however if you are modifying S1, it will be a .bin file instead.
Hopefully this helps you understand the basics of this topic.
{{S2Howtos}}
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