Steam Demo · choose your task

Demo settings

Choose SSE4.2 for the exact CPU error, OpenGL for a reversible graphics test, or Buy upgrades when double-clicking does nothing. The language and timer guides cover the other reported menu blockers.

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Diagnose the SSE4.2 CPU error at Demo startupCheck whether Windows exposes SSE4.2 to the Demo and distinguish a CPU instruction requirement from graphics, language or save problems.
Try a reversible OpenGL launch test for graphics crashesApply the community-proposed Godot compatibility flags in Steam, test the result and restore your original launch options if they do not help.
Buy upgrades when double-clicking does nothingUse the right-pane Buy button in the Demo upgrade screen, with the Linux player confirmation and checks for a purchase that still fails.
Change the Demo back to English on WindowsUse the reported settings.cfg locale value when an unreadable game menu blocks you, while keeping the original file and saves intact.
Does the Dispatch timer limit a Demo run?The October 5–6 player explanation of the Dispatch clock, its reported reset behavior and what it does not establish about the full game.

Each guide records its own build and source limits. Water connections use a V42 example; unversioned settings reports do not establish current full-game behavior.

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