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General game idea/implementation/tweaks
GameFlow: A Model for Evaluating Player Enjoyment in Games
The level of difficulty in games should be varied, gradually increasing to maintain the interest of the player but provide more challenge as he or she develops mastery [Desurvire et al. 2004; Pagulayan et al. 2003]. Games should not start out too difficult [Pagulayan et al. 2003], but invite players to try new strategies and extend their repertoire each time they play [Juul 2004; Pagulayan et al. 2003], culminating in the completion of the game [Johnson and Wiles 2003].