The Marionette

The Marionette is a first-person graphic adventure where you play a sculptor named Martin who, one ill-fated day, receives a mysterious package.

While opening it, Martin passes out and wakes up in a strange house. There, a mysterious man tells him that he has to play following a series a rules or he'll never make it home.

From this point, a traditional graphic adventure begins, where, from a first-person perspective, you have to explore the house and decipher the mysteries it holds. That is, if you want to make it home.

The Marionette is an intriguing graphic adventure that, in addition to being completely free, has an excellent story line that's worth discovering.