Direct answer
Valve classified Wanderburg as Playable on Steam Deck when checked September 11, 2026. The category was 2, and the report still listed manual-input and interface caveats.
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Valve rating: Playable
The current report says the default graphics configuration performs well and controller glyphs are shown, but some functionality may require touchscreen, a virtual keyboard, or a community configuration.
What the rating does not prove
A SteamOS compatibility result does not mean a native Linux build exists. It also does not establish frame rate, battery life, TDP, or ideal graphics settings for every device.