What this game-specific editor changes
Edit only Tidus current HP and current MP in the verified Final Fantasy X HD PC fixed-size save family and rebuild both stored CRC-16 copies.
Verified input boundary
The file must be exactly 26,880 bytes, expose the documented 25,848-byte inner buffer at file offset 8, contain the PC framing byte after that buffer, and have both CRC copies match the verified CRC-16 calculation before editing.
What is deliberately not claimed
No gil, inventory, sphere-grid, character switching, PS2/PSU/Vita/Switch conversion, checksum repair from an invalid base, or fields beyond the base Tidus current HP/MP offsets are claimed.
Output
A separate save copy with only Tidus current HP/current MP plus the two CRC words changed; all other bytes are preserved.
Instructions
Back up the save, close the game, select the 26,880-byte PC file, confirm Tidus HP/MP, edit within the published editor bounds, and retain the original until the copy loads.
Verification
Verified against FFXED load/save/CRC code and character field offsets, with two deterministic fixtures, an independent CRC reference, exact preservation assertions, original immutability, and post-write reopen.