So far, all methods of ACE credits warp have required executing the filename, controller 1, and controller 3 as code. This is inherently kind of inconsistent, as it requires moving the joystick to an exact Y position. It's also a bit of a hassle to have to hold the controller 3 joystick and buttons in place with rubber bands, and to manually hold a dozen buttons on controller 1 in the middle of a speedrun.
For these reasons, it would be greatly useful to have a credits warp payload that fits in filename alone. Up until now, this was believed impossible due to needing to have room to set up both a write value and a write location. But it turns out one of the registers we have already available when the filename payload executes has its value vary depending on exactly what is being rendered on screen during the current frame. This means that we can manipulate our write value without using up any filename instructions, just by looking at the ACE rock from a specific position and camera angle.
This single extra efficiency is enough to fit the payload in filename alone, but there is one extra catch: The manipulable register will only have the correct value every other frame. But this isn't nearly as bad as it sounds: we can test whether the correct value was written or not, because whenever the "next cutscene setter" (8011B9E2) is set to a valid cutscene ID, pausing is disabled. So we can just check by pausing whether the correct value was written or not. Overall, this means the credits warp is easier than ever before, with only the seed shot remaining as a single point of difficulty.
Full instructions below:
Set filename to 080126A3 A3B8CB53 which 81へベベNgべ. See for what characters to enter, because the identical-looking characters aren't.
(If using the OoT practice rom, a different filename is needed, 03E40008 A138C753.)
Do the run up to the seed cancel as before, except controller 3 is not necessary. The savewarp isn't needed either although it's apparently faster anyway.
Squish yourself in the corner just to the right of saria's door beneath the bridge.
Press cup (slightshot won't work) and rotate until the edge of the house goes through the cleft or cdown icon (this is not precise at all).
Exit cup and press start. If it does nothing, your "next cutscene setter" value has been set to the proper value and you're good to continue.
Otherwise, unpause and then enter and exit cup, then try pressing start again. Repeat until the start press has no effect. (50% odds each time)
Run into the house of twins. Note that you should hold down and NOT right for the first couple seconds while running there, otherwise the rock circle will reload and crash the game.
Once you enter, ganondorf's CURSE YOU will begin and the game is complete.
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