Sharing projects between classes and students?

I would like to be able to have students “play” other students’ games/apps. Is this possible by using the “share” link for each project? I created a Google Doc that has the link for each person’s project embedded.

  1. Will that enable other students to access other students’ projects in their own section?
  2. Will that enable other students to access other students’ projects in other sections?

I believe I could just activate the “share” option for students, but, for THEIR privacy, I’m not comfortable just opening the door. (It would be great if we could have the option to “share” just one project, rather than making it so that ALL of their projects are shared.)