8Th International Conference on Advances in Computer Entertainment Technology, Ace 2011, Date: 8 November 2011 through 11 November 2011, Location: Lisbon, Sponsors: Ydreams;Ordem dos Engenheiros;Cent. Inf. Tecnol. Inf. (CITI)- Dep. Inf./FCT/UNL;Fund. Cienc. Tecnol. (FCT) - Minist. Cienc.,;Tecnol. Ensino Super.