This is an unusual mod, with the brand new mechanic. The most part of game you will not be able to touch anything: you'll have to interact with boxes, energy balls etc. using your portals only.
*cough cough* world portals *cough cough*
*cough cough* Portal-1 has no "world portals"
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*cough cough* world portals *cough cough*
*cough cough* Portal-1 has no "world portals"