Assigned Rooms is a feature that is perfect to get your students creating rooms.
They do not need to create account, all you do is send a link out.
See our help article on how to use assigned rooms:
Use assigned rooms to distribute rooms to students and get them creating.
You can also use a normal room and invite users in to start building.
You need to enable "Edit Mode" for visitors. (See our article on Room Permissions.)
This can be useful for collaboration where you don't need multiple rooms per team or user.