RT @kevingerrior: Drew Davidson at CMU calls it design a game to be “pleasantly frustrated” to achieve FLOW #gbl #gamification http://t.co/wCjUDFuXH9

RT @kevingerrior: Drew Davidson at CMU calls it design a game to be “pleasantly frustrated” to achieve FLOW #gbl #gamification http://t.co/wCjUDFuXH9
