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The Flapping Door is an object in Sonic the Hedgehog, appearing in Labyrinth Zone. It appears just before water tunnels, opening and closing at timed intervals. When closed, the water tunnel is disabled. When it opens, the tunnel is enabled, resulting in Sonic being dragged into the tunnel if he is within range. The object is solid, and can be pushed, as well as stood upon (though the latter is not possible in normal gameplay).

File: _incObj/0C Flapping Door.asm

Changes from Sonic 1

• Word-length obPriority pointer due to the new Priority Manager.
• Word-length obRespawnAddr added due to the S3K Object Manager.
• Faster timer calculation during object initialization.
• Optimal Animation loading (changed addressing mode).
• The object has been completely reworked so that it is solid on both sides, and works correctly if mirrored horizontally. The animation script was also altered slightly as a part of this rework. (Credit: Hivebrain).

This object's subtype dictates how long it waits before opening/closing.

The formula is subtype*60.

	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	Anim	AniFrame	FrameTime
2x	~	~	~	DispWid	Routine	~	~	~	Subtype	~	~	~	~	~	~	~
3x	Wait	Wait	Time	Time	~	~	~	~	~	~	~	~	~	~	~	~

• Art Tiles: artnem/LZ Breakable Pole.nem (32 tiles; Nemesis-compressed)
• Sprite Mappings: _maps/Flapping Door.asm
• VRAM Location: ArtTile_LZ_Pole ($445)
• Animation Script: _anim/Flapping Door.asm

• ???