Aisle

“Late Thursday night. You’ve had a hard day and the last thing you need is this: shopping. Luckily, the place is pretty empty and you’re progressing rapidly. On to the next aisle… ”

Aisle rather than present a plot, presents an ambiguous situation and gives you a chance to type a single command. The command you type determines not only what the protagonist does, but also who he is. This is definitely “concept IF,” but the author has done an excellent job and it’s very easy to feel for the different possible protagonists. While the level of interaction is obviously limited in a one-move game, the scenery is very “deep”; the game seems to have a response for almost everything.