NOVEMBER, C. (2010) R.U.R.: Robots Universales de Rossum http://hipertextual.com/2010/06/rur-robots-universales-de-rossum
NUTT, C. (2011) The Valve Way: Gabe Newell And Erik Johnson Speak http://www.gamasutra.com/view/feature/134839/the_valve_way_gabe_newell_and_.php
NUTT, C. (2011) Steve Swink On The Art Of Experimental Games http://www.gamasutra.com/view/feature/134712/steve_swink_on_the_art_of_.php
NUTT, C. (2016) A look behind the scenes of Portal http://www.gamasutra.com/view/news/266391/A_look_behind_the_scenes_of_Portal.php
ORLAND, K. (2013) Antichamber is a mind-bending, four-dimensional journey http://arstechnica.com/gaming/2013/04/review-antichamber-is-a-mind-bending-four-dimensional-journey/
PARKIN, S. (2013) Games of the Generation: Portal http://www.eurogamer.net/articles/2013–10–21-games-of-the-generation-portal
PINJED (2013) Análisis de The Stanley Parable http://www.anaitgames.com/analisis/analisis-de-the-stanley-parable
PITTMAN, J. (2009) The Pac-Man Dossier http://www.gamasutra.com/view/feature/132330/the_pacman_dossier.php?page=3
REMO, C. (2010) Synthesizing Portal 2 http://www.gamasutra.com/view/feature/134512/synthesizing_portal_2.php
SAURAS, J. (2013) R.U.R. (Robots Universales Rossum), Karel Capek: El origen de la palabra robot http://www.fabulantes.com/2013/02/rur-karel-capek/
SHEFFIELD, B. (2010) Rewarding The Players: Valve On Portal 2 http://www.gamasutra.com/view/feature/134569/rewarding_the_players_valve_on_.php
SWIFT, K., WOLPAW, E. (2008) Integrating Narrative and Design: A Portal Post-Mortem http://www.valvesoftware.com/publications/2008/GDC2008_PortalPostMortem.pdf
TODD, H. (2013) Against orgasmic puzzle design http://www.gamasutra.com/blogs/HamishTodd/20130315/188616/Against_orgasmic_puzzle_design.php
– (2008) Exclusive: Inside The Making Of Portal http://www.gamasutra.com/view/news/107836/Exclusive_Inside_The_Making_Of_Portal.php
– (2012) Video: Making Portal 2, the sequel to a game that didn’t need one http://www.gamasutra.com/view/news/173723/Video_Making_Portal_2_the_sequel_to_a_game_that_didnt_need_one.php
– (2012) Taking advantage of a player’s animal instincts with Portal’s Kim Swift http://www.gamasutra.com/view/news/169842/Taking_advantage_of_a_players_animal_instincts_with_Portals_Kim_Swift.php
– (2012) Death to the non-interactive cutscene, say top game writers http://www.gamasutra.com/view/news/165491/Death_to_the_noninteractive_cutscene_say_top_game_writers.php
– (2013) Untold Riches: An Analysis Of Portal’s Level Design https://www.rockpapershotgun.com/2013/09/20/untold-riches-an-analysis-of-portals-expressive-level-design/