monkey: if players are too slow or give too many wrong answers, they lose the game. This added time pressure is significant as a design strategy, as it has the additional effect that players need to divide their attention between solving the math, and the actual game mechanics (shooting, avoiding traps, etc.). The time pressure makes sure players have to solve the math exercises fast, but it also de-emphasizes the math exercises, as players have to divide their attention across different tasks. The math-solving skill becomes only one of the various skills needed to play. The time pressure,
however, is not present in the Bridge of Death levels: as a part of the 3D world, players can solve the Bridge of Death exercises at their own pace. In this sense, the Bridge of Death not only stands out in the structural analysis: when looking at the interactivity, there is also a significant difference in time pressure between arcade game exercises and Bridge of Death exercises.