The sp_sphere_of_roundness.zip file you have requested: Maps Levels Missions / Single Player / Portal 2 Map - Sphere of Roundness - 2.29mb is not available. Perhaps try browsing all files for the game Portal 2 and upload any files you want to share or are missing. This is the only information we could locate:

This is a small single-player sphere map for Portal 2. This is a small single-player sphere map for Portal 2.

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