Here are links to the possible readings you can choose for the Critique essay:
Aarseth_Genre_Trouble_selectable_text
This video is required viewing before reading Ebert’s piece:
http://www.youtube.com/watch?v=6GjKCnPQlSw
http://www.rogerebert.com/rogers-journal/video-games-can-never-be-art
http://www.gamasutra.com/view/feature/130840/videogame_aesthetics_the_future.php?print=1
“… the value of a game is strictly internal, determined ambivalently by the rules”