In order to play Portal: Prelude you need to have Steam/Portal installed on your system. Portal: Prelude is an unofficial prequel for Valve's hit title Portal. Its story revolves around the pre-GlaDOS epoch, even before she was plugged in. At this
This new version is shipped with more than 115 bug fixes, improvements and additions (since 1.0.0). We know everything's still not perfect, but we believe we put enough work in this mod and thus, this version should be considered final (except if som
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