PortalChamber (pochmb_) is a new map series releasing as one chamber at a time.
Here we go, I got 2nd chamber made in same day. This one is bigger and harder I can say. Put two folders from zip file to your ...portal/portal/. If you haven't completed 1st chamber, go download it from here and do it now, then start this one :P. Additional screenshots:
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is this made in Portal Map Editor
Yes, if you mean po_edit.
nice