4.1 Space Rescue
We evaluated our tool on Space Rescue, an educational game that we designed to teach fractions.
This is a grid-based puzzle game in which players must split and redirect lasers to targets.
In order to reach the targets, the player must correctly place a variety of pieces onto the grid; some of these pieces redirect lasers and others split lasers equally into two or three smaller lasers.
All of the pieces have an entrance, indicated by a large funnel, and one or more exits, indicated by smaller nozzles.
Targets also have entrances, indicated by a gray tube, as well as a label identifying what fraction of the original laser they require.
The game ends when all of the targets have been satisfied. An example of a level of this game can be seen in Figure 5.