Daily living skills are difficult for autistic children to learn because they have low motivation in learning new things. Some research has developed virtual environment to assist parents and teachers teaching autistic children daily living skills, educators still need to spend a lot of time in preparing personalized and more realistic tasks for children to practice. This research designs an activity generation mechanism by measuring activity's weight with fuzzy theory and rough sets help. Based on the activity generation mechanism and weight measurement, a Flash-based situated game is developed for providing autistic children personalized and non-repeated practices of activities of daily living. An evaluation plan of the pilot for verifying the effectiveness of the game and gathering the users' (include teachers, parents, and the autistic children) perceptions toward the game and the game-play is designed.