Sonic Adventure DX – Steam Deck Guide (How to Run the Game)

This is a guide on playing Sonic Adventure on the Steam Deck, and installing the Dreamcast Conversion Mod (aka the ultimate way to play Sonic Adventure).

How to Play on Steam Deck

Note: Credit goes to Blasterfight

1. Install Sonic Adventure DX from the Steam Store;
2. On your Deck, go into Desktop mode;
3. Download the Dreamcast Conversion Mod installer from the developer website.
4. Extract the downloaded archive;
5. Right click on the extracted sadx_setup.exe and press “Add to Steam”;
6. Press “Browse” and navigate to the sadx_setup.exe
7. Now sadx_setup.exe will appear in your Steam Library. From there right click on it, press proprieties, and under the Compatibility tab tick “Force the use of a specific Steam compatibility tool” and close the window;
8. Start the installer and progress normally. When asked for the destination folder, input the directory where SADX is installed, by default Z:\home\deck\.steam\steam\steamapps\common\Sonic Adventure DX\
9. After the installation is complete you can remove sadx_setup.exe from your library;
10. Start SADX and select “Configure Sonic Adventure DX”, then press on mods. This will launch the SADX Mod Loader;
11. In the SADX Mod Loader you might want to enable the Steam Achievements Mod. Then go to the Graphics tab and set FMV Fill Mode: to “Fit”, then Save.
12. Right click SADX in your library and press “Properties…”, in the textbox under Launch Options instert this text:

WINEDLLOVERRIDES="d3d8=n,b" %command%

It’s very important!