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Beat two Portal advanced maps.

3 guidesOffline Game ModeSingle Player
Crimson DrifterCrimson Drifter870,811
04 Feb 2009
52 0 1
Once you finish the regular campaign maps of Portal, you will open up 6 advanced maps available for play. The advanced maps are simply six maps you have played before, just some little tweaks to make it harder. Once you finish any 2 maps this achievement will unlock

The below videos will guide you through each advanced map (they are in order 13,14,15,16,17, then 18)
AndresFRVargasThank you!!!!!!!!!!!!!!! headspin
Posted by AndresFRVargas on 08 Apr 13 at 22:03