Keyhole

From SMWiki

Super Mario World Sprite
Keyhole
File:Noimage.png Upload one!
Sprite number(s)	E
Type	Normal sprite
GFX file(s)	GFX01 (SP2)
Palette(s)	8

A keyhole ends the level and activates the secret exit when a key is carried into it. It can also be triggered if you are riding a Yoshi, the Yoshi has a key in its mouth, and you walk into it. Not all levels in Super Mario World have keyholes; some that do are Donut Plains 1 and 2, Vanilla Dome 1 and 2, Forest of Illusion 3, Chocolate Island 2, and Valley of Bowser 4. The keyhole is sprite E, and the key is sprite 80.

Glitches

There is also an interesting glitch where in one of the Forest of Illusion levels, if you have the key in Yoshi's mouth, and you stand right above the keyhole, when the time up comes, you will go up, then fall down onto the keyhole.

Another, while it is not abusable, is a set of two actions that may take place while the "keyhole expansion" is taking place. The first is while riding a Yoshi with a key in its mouth, you can spit the key out, leaving it frozen in place in the foreground of Yoshi's head until the keyhole recloses. The second glitch, while pointless and serves no purpose whatsoever, is that you can duck as many times as you want while on Yoshi, before the keyhole recloses. Both of these glitches are cool, and otherwise useless while playing.

It is possible to jump infinitely with a key, cape, and wall, while fluttering, hold the key and hug the wall while falling, then throw the key to the wall and if done correctly, Mario will be able to jump up and hold the key at the same time.

Notes

The keyhole expansion and shrinking uses windowing HDMA to achieve this effect.

Related Addresses

RAM Addresses
SNES	Description
$7E:04A0	HDMA table for windowing effects (keyhole, level end, etc.)
$7E:1433	Scaling factor of the growing circle before the Titlescreen starts. Starts at 0, circle gets bigger when the value increases. Loads titlescreen when value becomes #$F0 or higher. Also used for the keyhole.
$7E:1434	Set to #$30 to end level via keyhole
$7E:1435	Keyhole growing/shrinking flag.
$7E:1436	Keyhole X position
$7E:1437	Keyhole Y position

ROM Addresses
PC	SNES	Description
x04D12	$00:CB12	Opening window data. x4DA3 - Change 4B to 49 to fix a misplaced tile on the keyhole "iris in" effect.
x0E3D1	$01:E1D1	Sprite that can unlock keyholes in its stunned status (Default is 80: Key)
x0E411	$01:E211	Keyhole shrinking timer.
x0E416	$01:E216	Keyhole music
x0E451	$01:E251	Top tile of keyhole
x0E456	$01:E256	Bottom tile of keyhole
x0E45B	$01:E25B	Keyhole palette/GFX page