RobotFindsKitten has been ported to a lot of different platforms, and now it's available in IF. It uses a lot of different functions which not all interpreters support, so there's a chance you'll need a different interpreter to try this out. You will need arrow keys as well.
The "gameplay" (although this isn't much of a game) is simple: move the robot around, touching various objects until you find the one that's Kitten. You can change the "difficulty," which is merely the number of objects in the playfield.
What's fun about this piece that's self-described as a "Zen Simulation" is the humorous descriptions of the various objects. Every person who has ported RFK to some other platform has probably had more fun coming up with a list of object descriptions than the players have had finding Kitten.
If you have a few minutes to kill, give this one a try. It doesn't pretend to be anything more than it is.