DeltaHATE modified to work with Super Ledgehop Double Laser
download UndertaleModTool
download the script
backup the game's original data.win somewhere
open the game's data.win in UndertaleModTool
select the script and wait for it to finish
overwrite the game's original data.win
run the game
(./ being the UndertaleModTool directory)
./seed is read and used instead of random generation if it exists and is not 0 or empty
./lastSeed is written at the end of the script, simply contains the last seed used
there's a possibility this might actually somewhat work with some other games with similar structure, although save files will likely be broken which can lead to crashes (as it does in Super Ledgehop)