Ok I cannot make a fool-proof tutorial about this just now because I didn't do much troubleshooting, but feel free to follow my steps if you want to play the 16 new DLC tracks of Mario Kart 8 running in Loadiine. EDIT: now with DLC background music too! Limitations Offline only obviously New tracks are actually swapped with original ones M̶u̶s̶i̶c̶ ̶f̶r̶o̶m̶ ̶t̶h̶e̶ ̶n̶e̶w̶ ̶t̶r̶a̶c̶k̶s̶ ̶c̶a̶n̶'̶t̶ ̶b̶e̶ ̶p̶l̶a̶y̶e̶d̶,̶ ̶s̶o̶ ̶y̶o̶u̶ ̶c̶a̶n̶ ̶c̶h̶o̶o̶s̶e̶ ̶b̶e̶t̶w̶e̶e̶n̶ ̶t̶h̶e̶ ̶m̶u̶s̶i̶c̶ ̶f̶r̶o̶m̶ ̶t̶h̶e̶ ̶t̶r̶a̶c̶k̶s̶ ̶y̶o̶u̶ ̶r̶e̶p̶l̶a̶c̶e̶,̶ ̶o̶r̶ ̶n̶o̶ ̶m̶u̶s̶i̶c̶ ̶a̶t̶ ̶a̶l̶l̶ ̶(̶n̶o̶t̶ ̶s̶o̶ ̶n̶i̶c̶e̶)̶ Not sure if battle mode works Tested setup Firmware 5.3.2 EU Mario Kart 8 EU updated to 4.1 Loadiine 4.0 with Smash Bros Mode (Mii Maker mode doesn't work with MK8 4.1 update) Steps 1. Get your hands on a dump of the DLC 1 and 2 2. The new DLC tracks are contained in separate folders within the "course" folders. For instance, the files for the Ribbon Road track are in a folder named "Dagb_RibbonRoad" in "course" 3. On your SD card which contains your MK8 game files, locate the original track you want to be replaced with any desired DLC track. They are in SDCard/wiiu/games/MK8foldername/content/course. NOTE: They have prefixes which will help you figure out what system the track was originally released on. For instance, "G3ds_DKJungle" is the DK Jungle track from the 3DS system, and "Gu_Techno" is the Electrodrome track first released on the Wii U. 4. Delete every file in such folder except for the .bars file which is the music track, unless you want to play without the music. N̶O̶T̶E̶:̶-̶I̶f̶-̶y̶o̶u̶-̶r̶e̶p̶l̶a̶c̶e̶-̶t̶h̶i̶s̶-̶f̶i̶l̶e̶-̶w̶i̶t̶h̶-̶t̶h̶e̶-̶.̶b̶a̶r̶s̶-̶f̶i̶l̶e̶-̶f̶r̶o̶m̶-̶t̶h̶e̶-̶D̶L̶C̶-̶t̶r̶a̶c̶k̶-̶a̶n̶d̶-̶r̶e̶n̶a̶m̶e̶-̶i̶t̶,̶-̶t̶h̶e̶-̶g̶a̶m̶e̶-̶w̶i̶l̶l̶-̶c̶r̶a̶s̶h̶-̶u̶p̶o̶n̶-̶l̶o̶a̶d̶i̶n̶g̶-̶t̶h̶e̶-̶t̶r̶a̶c̶k̶.̶-̶B̶u̶t̶-̶i̶f̶-̶y̶o̶u̶-̶j̶u̶s̶t̶-̶d̶e̶l̶e̶t̶e̶-̶i̶t̶-̶a̶n̶d̶-̶d̶o̶-̶n̶o̶t̶-̶r̶e̶p̶l̶a̶c̶e̶-̶i̶t̶,̶-̶t̶h̶e̶-̶t̶r̶a̶c̶k̶-̶w̶i̶l̶l̶-̶s̶t̶i̶l̶l̶-̶l̶o̶a̶d̶,̶-̶j̶u̶s̶t̶-̶w̶i̶t̶h̶o̶u̶t̶-̶b̶a̶c̶k̶g̶r̶o̶u̶n̶d̶-̶m̶u̶s̶i̶c̶.̶-̶S̶o̶-̶i̶f̶-̶y̶o̶u̶'̶d̶-̶r̶a̶t̶h̶e̶r̶-̶h̶a̶v̶e̶-̶a̶-̶w̶r̶o̶n̶g̶-̶t̶u̶n̶e̶-̶t̶h̶a̶n̶-̶n̶o̶n̶e̶,̶-̶y̶o̶u̶-̶m̶a̶y̶-̶w̶a̶n̶t̶-̶t̶o̶-̶p̶i̶c̶k̶-̶t̶r̶a̶c̶k̶s̶-̶w̶h̶o̶s̶e̶-̶m̶u̶s̶i̶c̶-̶s̶h̶a̶r̶e̶s̶-̶a̶-̶s̶i̶m̶i̶l̶a̶r̶-̶m̶o̶o̶d̶. EDIT: see step 7 for how to add DLC background music 5. Paste in there all the files from the DLC track folder, except the .bars background music file, and take note of which track you swapped it with. WARNING: in the dump I used, the Mute City DLC track had one file mispelled as "course_muuntO.byaml" instead of "course_muunt.byaml", so be sure to rename it accordingly, or the game will crash upon loading the track. 6. Copy all the folders found in the "mapobj" folders contained in the DLC dump, and paste them into the MK8foldername/content/mapobj folder on your SD card. 7. Browse to the MK8foldername/content/audio/stream folder where the background music is stored. Each race comes with 2 background music files, one ending with "N" (normal pace?) and one ending with "F" (final lap's pace?). Locate the music files of the desired DLC track and the original track you replaced it with, make a copy of the DLC track's music files and rename them exactly as the original track's, matching the N and F files respectively. So for instance, if you want to replace Electrodrome with Ribbon Road, you'd have to copy "pBGM_GBA_RIBBONROAD_N.bfstm" rename it as "pBGM_WU_TECHNO_N.bfstm" then copy "pBGM_GBA_RIBBONROAD_F.bfstm" rename it as "pBGM_WU_TECHNO_F.bfstm" 8. This *probably* means that if you feel like adding custom music, you can convert any tune to the BFSTM format using nasty's BRSTM/BCSTM/BFSTM Conversion Tool, and go through step 7 the same way. I haven't tested this yet. 8. Put your SD Card back in the Wii U and load your hacked MK8 game! 9. If that was worth it, say thanks! or just press the Like button Improvements I̶t̶'̶d̶ ̶b̶e̶ ̶n̶i̶c̶e̶ ̶t̶o̶ ̶b̶e̶ ̶a̶b̶l̶e̶ ̶t̶o̶ ̶p̶l̶a̶y̶ ̶t̶h̶e̶ ̶D̶L̶C̶ ̶b̶a̶c̶k̶g̶r̶o̶u̶n̶d̶ ̶m̶u̶s̶i̶c̶,̶ ̶I̶ ̶j̶u̶s̶t̶ ̶h̶a̶v̶e̶n̶'̶t̶ ̶m̶e̶s̶s̶e̶d̶ ̶a̶r̶o̶u̶n̶d̶ ̶l̶o̶n̶g̶ ̶e̶n̶o̶u̶g̶h̶ ̶t̶o̶ ̶f̶i̶g̶u̶r̶e̶ ̶o̶u̶t̶ ̶a̶ ̶w̶a̶y̶ ̶j̶u̶s̶t̶ ̶y̶e̶t̶. Done. Playing with DLC characters (at least visuals and voice) Anybody knows what are the "battle_muunt.byaml" and "course_muunt_200.byaml" files for? For some reason they are not here for every track.