If you really trust the design of the game, it can also be an excellent assessment tool! (edutopia.org)
This tool is to be used to give teachers a general idea about how their class performed on a written task, and is an excellent assessment tool to use in order to evidence areas of strength / weakness of a particular group or individual child's written work. (tes.com)
Documentation through pictures and / or video I believe this is an excellent assessment tool because it can activate prior knowledge, it allows the students to make real connections to their work and it provides a great visual for not only students to examine, but also their parents / guardians. (tribes.com)