Final Fantasy III: Trigger Happy

In Zone Eater Cave, there's a room with a ceiling that falls every four seconds or so. The game uses tile-based event triggers to determine if you avoid being crushed, except that if the ceiling's timer expires at the wrong time, it supersedes the tile-based event triggers and prevents them from declaring you safe, meaning that you can die even if the ceiling misses. It also means you can survive even if you get crushed, or that Terra can bypass the exits to the room and walk about the darkness without falling. This patch makes the ceiling respect tile-based event triggers.

Final Fantasy 3 (US/SNES), Final Fantasy 6 (JP/SFC)
Trigger Happy Bug Fix patch

CONTENTS:
FF3-TriggerHappy-H.ips: The fix patch for a headered SNES ROM file. Apply to fix the Trigger Happy Bug.
FF3-TriggerHappy-HR.ips: The reverse patch for a headered SNES ROM file. Apply to reverse all changes made by the previous patch.
FF3-TriggerHappy-HR-old.ips: The old reverse patch for a headered SNES ROM file. Apply to reverse all changes made by previous versions of this patch.
FF3-TriggerHappy-N.ips: The fix patch for a non-headered SNES ROM file. Apply to fix the Trigger Happy Bug.
FF3-TriggerHappy-NR.ips: The reverse patch for a non-headered SNES ROM file. Apply to reverse all changes made by the previous patch.
FF3-TriggerHappy-NR-old.ips: The old reverse patch for a non-headered SNES ROM file. Apply to reverse all changes made by previous versions of this patch.
FF6-TriggerHappy-H.ips: The fix patch for a headered SFC ROM file. Apply to fix the Trigger Happy Bug.
FF6-TriggerHappy-HR.ips: The reverse patch for a headered SFC ROM file. Apply to reverse all changes made by the previous patch.
FF6-TriggerHappy-HR-old.ips: The old reverse patch for a headered SFC ROM file. Apply to reverse all changes made by previous versions of this patch.
FF6-TriggerHappy-N.ips: The fix patch for a non-headered SFC ROM file. Apply to fix the Trigger Happy Bug.
FF6-TriggerHappy-NR.ips: The reverse patch for a non-headered SFC ROM file. Apply to reverse all changes made by the previous patch.
FF6-TriggerHappy-NR-old.ips: The old reverse patch for a non-headered SFC ROM file. Apply to reverse all changes made by previous versions of this patch.
readme.txt: This file.
Trigger Happy.rtf: An index of the code changes.

AFFECTED AREAS:
SNES: C0/9996-C0/9999, C0/D82F-C0/D8B8, CB/8149-CB/81A0
SFC: C0/98CB-C0/98CE, C0/D82F-C0/D8B8, CB/813F-CB/8196

PATCH INFORMATION:
SNES patches work on ROM v1.0 or v1.1.

URGENCY:
Medium. Specific to only one location, but could be serious under the right circumstances.

PURPOSE:
The room inside Zone Eater Cave that contains a falling ceiling, though clever, is also problematic. The ceiling is controlled by a timer, and it falls as soon as the timer expires. There are a few tiles that activate auto-resetting flags that determine if the player is safe, so if you're standing on one of these tiles, you'll end up going through the allowed holes instead of getting crushed. However, if you step onto one of these tiles at the very last second, the ceiling will fall before the tile has a chance to trigger its event script, meaning that you can be killed despite being clear of the ceiling. This patch modifies the ceiling fall event to allow tile-based events to trigger beforehand.

The worst effect of this bug is that Terra can bypass the event triggers at the exits to the room, which allows her to wander anywhere on the map and venture way out of bounds. This works because of a secondary bug that causes her to take an extra step when the ceiling falls. Although this patch does not fix that bug, it is enough to prevent Terra from bypassing those event triggers on the exits.

VERSION HISTORY:
v1.0 (July 31, 2017): Initial release.

Final Fantasy III (USA)
CRC32: E969BD77
MD5: A684517EBD29308C2E3B55D371E15245
SHA-1: 23422176191B371F01AE3A7CFE7455A2022F8EE8
SHA-256: 6F6911ED4A0E9844770035A3C39157F8C3929C321D5AFACBAFDA39C835B44374
Includes patches for headered and non-headered ROMs
Includes patches for SNES and SFC ROMs