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Retro Track Grand Prix

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digdat0 edited this page Oct 30, 2026 · 2 revisions

MKDD-NX can play Mario Kart: Double Dash!! Retro Track Grand Prix 2.1 (RTGP) by Portable Productions (with additional credits to ShaneMGD, LMFinish, AdolescentSeagull, Tarsa, Yoshi2 and Cristian64), with its retro cups and courses. It comes as a patch of the game's disc; MKDD-NX installs it on the Switch, so you don't need a PC tool to patch your disc image, and the standard game stays playable. The mod isn't included with MKDD-NX.

Install

  1. Download mario_kart_double_dash_rtgp_2_1.zip from the mod's GameBanana page and unzip it. The mod is too big for GameBanana: the zip only holds OPEN ME.txt with the link to the patch. Download the patch from that link: MKDD RTGP 2.1 Update.xdelta (about 2 GB).

  2. On the SD card, create sdmc:/switch/MKDD-NX/mods/ and copy the .xdelta file into it as it is (any name ending in .xdelta works):

    sdmc:/switch/MKDD-NX/
    MKDD-NX.nro
    Mario Kart - Double Dash!! (USA).iso     (or .rvz)
    mods/
        MKDD RTGP 2.1 Update.xdelta

  3. Start the game. It finds the patch and asks INSTALL RETRO TRACK GRAND PRIX 2.1?: choose INSTALL NOW. It takes a few minutes (B cancels) and writes the mod's files to mods/rtgp/, about 2 GB more on the SD card. The patch is applied to your own disc image, which stays as it is; an .rvz works as well as an .iso.

  4. When it's done, the game offers to delete the .xdelta file. It's no longer needed, and deleting it frees about 2 GB. Then the game starts in RTGP.

Switch between RTGP and the standard game

On the − menu's Mods page, set Level pack to RTGP, PLUS or OFF (the standard game), then choose Restart now.

Saves

RTGP keeps its own saves in save/rtgp/, apart from the standard game's and Plus's. The first time, the game offers to start from a copy of your standard save.

In the game

In a cup, X and Y switch between the mod's course sets.

Problems

What you see What to do
The patch is reported on screen and left alone Only 2.1, Baby Mode 1.4 and Classic 1.4 work. A patch for another version or another game isn't installed.
Not enough space The install needs about 2 GB free besides the patch itself.

Baby Mode and Classic

The same mod comes in two alternate versions, both 1.4, on the Files list of the same GameBanana download page:

Version What it is Download Patch inside Level pack Saves
RTGP Baby Mode 1.4 easier, for newcomers rtgp_baby_mode_1_4.zip Baby Mode 1_4.xdelta RTGPBABY save/rtgpbaby/
RTGP Classic 1.4 with the classic soundtrack mario_kart_double_dash_rtgp_classic_ost.zip Mario Kart Double Dash RTGP Classic OST 1_4.xdelta RTGPCLASSIC save/rtgpclassic/

They install exactly as 2.1 does above:

  1. Each zip holds only a readme with a Google Drive link to its patch: download the .xdelta from that link.
  2. Copy the .xdelta into sdmc:/switch/MKDD-NX/mods/ as it is.
  3. Start the game and choose INSTALL NOW when it asks INSTALL RTGP BABY MODE 1.4? or INSTALL RTGP CLASSIC 1.4?. Each is written to its own folder (mods/rtgpbaby/, mods/rtgpclassic/), about 2 GB each, then the game offers to delete the patch.

You can install 2.1, Baby Mode and Classic side by side and pick one with Level pack on the − menu's Mods page, then Restart now. Each keeps its own saves.

In a cup, X and Y switch between the course sets, as in 2.1.

LAN play

LAN play doesn't work with any version of RTGP: its LAN entry runs code the mod loads from the disc, which MKDD-NX doesn't have. Set Level pack to OFF for LAN play.

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