WARNING : Deltarune has only 3 file to save you game so be carefull if you realy want to use this method then it will delete all of you progression i recommend to put the file0 in a secure folder on you computer then you will not lose your entire progression .

If you are too busy to play a game for 2 hours straight to do a special route to get a combat at the end then let me show you the Spamteon save editor tool

( Works with the 2 chapters )

you hAve to put the file0 in the %LOCALAPPDATA% of you computer and after you click on undertale you will see a file named file0 , delete it and put the new file0 you just have downloaded