Despite of solving many challenges by using Unity 3D,
several issues remain to be addressed in future research as
suggested in discussion. Unity version of the game was
developed from scratch as a proof-of-concept, thus it lacks
some features such as GPS, collision detection between
multiple AR objects and, most important of all, flexibility in
terms of game content management. In future research we seek
to integrate these two versions but this task will require
significant efforts as underlying systems are quite different.
Finally, user evaluation should be widened to cover larger
sample sizes and deepened with more detailed instruments.