Playing two games at the same time is nothing new. Instead, I brought "thinking with portals" to the extreme by connecting the portal placements of both games.

This mod is unfortunately too complicated to be made public, but other mods like this can be played on Spplice: https://p2r3.com/spplice
Thanks to dustyhobo for the amazing music, and thank you for watching.

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Tracks used in order:
-   / morning  
-   / blood  
-   / freedom  
-   / nights  
-   / despondent  
-   / hey  
-   / soul