To play this one-person game well, students need to work with equivalent fractions, and be able to add and subtract fractions. Don't forget to turn the sound on!
http://illuminations.nctm.org/ActivityDetail.aspx?ID=18

Here is a neat two-person version of the game.
http://standards.nctm.org/document/eexamples/chap5/5.1/

And here is the above game without all of the instructions:
http://standards.nctm.org/document/eexamples/chap5/5.1/#applet