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If you encounter a stack trace pointing to Mono, you can force the game to use your system-installed Mono runtime instead of its bundled, older environment: mono Terraria.exe Use code with caution. Permissions Denied

Under , ensure the checkbox for "Force the use of a specific Steam Play compatibility tool" is unchecked . This forces Steam to download the native GNU/Linux binary rather than the Windows version via Proton. Multi9 Language Setup terraria 1449 multi9 gnu linux native verified

For Steam Deck owners, this is the crown jewel. The "Verified" status means: If you encounter a stack trace pointing to