The interaction ladder
Five choices, easiest first
Learners pick one rung and make it work. Picking one is what makes this fit a session.
The rung is a choice about how you want to be known, not a difficulty setting. A quiz says a person can be known by their answers. A timeline says you are best understood in order.
The top two rungs hold on to information, which is what makes them harder. Once something is remembered, a learner has to be able to say what is kept, for how long, and who else can see it. Groups working at Remix or Generate need a session for that question alone.