Uploaded November 2010 | Updated September 2026, 3 hours ago

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**UPDATED** - This shows how to complete the explore challenge in the Portal Pro mod in 1 portal. It is a little tricky though as it uses ABH...I would probably just settle with the 2 portal method but if you really want the 1 portal on your scoreboard then this is the way to do it.

Download the mod at moddb.com/mods/portal-pro