Portal is a natural theme for Valentine's Day, as we saw with these cards Valve released in 2011 before Portal 2's arrival. This one is the best of a Valve-themed series done by Tumblr user applenail, which got a lot of attention over the weekend and yesterday.
Print them out and put one in a friend's locker next Thursday.
VALVEntines [applenail.tumblr.com]
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