Final Exam
Final Exam is a text adventure game, made with Inform 6, inspired by games from the 80s.
Here is the Z machine file: fnlexam.z5
I had some playtesting help from my wife, Ted Casaubon, Steven Postma, Olly Kirk and various anonymous transcripts from people who played the game during IFComp 2015 and posted feedback on the IFComp forum. This helped a lot.
Final Exam has a 'HINT' command and it should always be possible to progress to some ending (there are several). If you are really stuck, you can look at the walkthrough (PDF), though this only describes one solution to the game.