The main disadvantage of the use of games in the classroom is the amount of time it takes for both the student and teacher to guide themselves within the game. Squire (2005) describes several sessions using simulation games showing the considerable effort needed by the teaching staff to use the game in the curriculum. In the interesting dissertation by Egenfeldt-Nielsen (2005), he concludes that we need more experiences in the classroom to see what happens when computer games area brought into an educational setting accompanied by sound didactic considerations.