Do you have access to units of caring?

Are you trying to gain knowledge, get a piece of paper, both, one as a side effect of another?

"actually graduate" versus "see if they learn anything" might hugely inform your process. Off-the-cuff I'm guessing you want to actually graduate first with hopes of nice learning side effects, then see if they learn anything via something that takes longer.

Also a consideration: 3+ arms. Instruction game, instruction non-game, and non-instruction game. Also possibly non-instruction non-game.