The Lighthouse

This is a game I played last year. You have 3 doors, 4 rooms, two keys, a container, and a button. Nothing is hidden, there are some typos, and the authors manually insert the winning text into the game without actually ending the game.

As a historical curiosity, this, along with Detective, is one of the best known games with minimal coding due to its entry in IFComp, among other reasons.