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The Auto Roll Tag is an object in Sonic the Hedgehog, theoretically able to appear anywhere in the game where its necessary to force Sonic into a roll state, though it only appears in Green Hill Zone. The functionality of this object is what forces Sonic to roll through the S-shaped tunnels in Green Hill Zone.

This object was backported from Sonic 2, removing the need for the dedicated subroutine found in Sonic_Loops.

File: _incObj/04 Auto Roll Tag.asm

Changes from Sonic 1

• This object replaces the original system, wherein forced roll handling was performed via a dedicated subroutine. If Sonic ran through specific chunks, he would be forced into a roll state. This object, in conjunction with Object 03, completely eliminates any need for that subroutine.

Changes from Sonic 2

• Word-length obPriority pointer due to the new Priority Manager.
• Word-Length obRespawnAddr added due to the S3K Object Manager.
• The object has been slightly rewritten to process more efficiently.

• Bits 0 and 1 dictate the size (in pixels) of the tag. Values 0-3 yield the sizes $20, $40, $80, and $100.
• Bit 2 determines Orientation. If clear, the tag is vertical. If set, it's horizontal.

	x0	x1	x2	x3	x4	x5	x6	x7	x8	x9	xA	xB	xC	xD	xE	xF
0x	Render	Addr	Addr	Addr	Gfx	Gfx	Map	Map	Map	Map	XPos	XPos	XPos	XPos	YPos	YPos
1x	YPos	YPos	~	~	RespawnAddr	RespawnAddr	~	~	Priority	Priority	Frame	~	~	~	~	~
2x	~	~	~	DispWid	~	~	~	~	Subtype	~	~	~	~	~	~	~
3x	Radius	Radius	Flag	~	~	~	~	~	~	~	~	~	~	~	~	~

• Sprite Mappings: _maps/Collision Switcher.asm
• VRAM Location: ArtTile_Ring ($5F4)

• Obj84 - Sonic 2
• Obj_AutoSpin - Sonic 3K