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Half-Life Hints
What are these glowing orbs floating in the air?
1 of 5: The glowing orbs are actually teleportation portals.
2 of 5: The green ones with orange halos are entrance portals. The orange ones with green halos are exit portals.
3 of 5: Every entrance portal has at least one exit portal.
4 of 5: If you are in the test laboratory where two portals are behind glass cases, try them out.
5 of 5: Run into the green portal and you will pop out in the orange portal.
