Say Happy Valve-entine's With This Delightful Card Series

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]