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TheSega Master System, an 8-bit competitor to the NES, offered fans fantastic games that were either exclusive to the console or had unique versions. Notable titles on the Sega Master System included exceptional ports and versions ofGolden Axe, Double Dragon, andStreets of Rage, among others. The console even stretched its capabilities with games likeMortal KombatandAsterix & Obelix, which performed closer to 16-bit Megadrive/Genesis titles of that era.
Enthusiasts of retro gaming are limited whenplaying Sega Master System gameson a modern system, yet the Steam Deck, coupled with a robust program known as EmuDeck, makes this feasible. Here’show to install the emulators for Sega Master System games on the Steam Deck.
Updated May 13, 2025 by Michael Llewellyn:EmuDeck and Decky Loader have cross compatibility now, making the experience of running retro games like Sega Master System titles run better with the Power Tools plugin and more. However, Decky Loader now requires a Sudo Password for admin permissions before installing it. This guide is updated to include the steps for creating a Sudo Password.
Before Installing EmuDeck
Before installing EmuDeck on the Steam Deck for Sega Master System games, you must have the appropriate tools and settings for a seamless installation process:
Activate Developer Mode
Before installing emulators and expecting to run games properly on the Steam Deck, you must activate Developer Mode to ensure everything plays and runs smoothly.
CEF Remote Debugging can get disabled after an update. This can deactivate plugins, programs, and interfere with the emulators. Always check the Developer Menu after an update to ensure it remains switched on.
Installing EmuDeck In Desktop Mode
RetroArch can run various emulators for classic gaming systems through a single application. These are accessible under the ‘Emulators’ tab in the Steam library.
Transferring Master System Roms
With RetroArch and EmuDeck installed, it’s time to transfer your Sega Master System ROMS to their desired folders.
Adding Master System Games To The Steam Library
Even though you can runthe Sega Master System gamesfrom Retroarch in Desktop Mode, you’ll want to add the games to your Steam Library to play them in Gaming Mode.
Given that the Sega Master System is a retro console, it’s possible to encounter missing or incorrect artwork. Use the following steps to replace or fix the cover art.
Use the following steps to upload a cover if the Steam ROM Manager doesn’t locate one for you:
Playing Master System Games On The Steam Deck
After the Steam ROM Manager has finished uploadingthe covers and game artworkto the Steam library, you can access the emulated games the same way as the official ones.
Improve Performance
Some classic games can have stuttering and frame-rate issues when running on the Steam Deck. Use the following steps to address this:
Install Decky Loader For The Steam Deck
The EmuDeck developers recommend installing Decky Loader and the plugin Power Tools for all emulated games so you have more power and control over the Steam Deck’s performance. Follow these steps to install them:
Create A Sudo Password
The Decky Loader program may require yoursudo password.To set this up, use the following steps:
Install Power Tools
With Decky installed, you can now add the Power Tools plugin by following these steps:
Power Tools Settings For Emulated Games
Fixing Decky Loader After A Steam Deck Update
Major Steam Deck updates can make alterations to the menu and settings. This can result in third-party apps getting removed from your Quick Access menu. Follow these steps to restore it and your plugins:
