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Activate the Three Artefacts and then Leave is a freaky voyage into the unknown. After moving the mouse around, you'll spot a sphere in the distance, and can move toward it using the WASD keys.

There you'll find a gap in the wall that will allow you to move inside. What looked like a relatively small structure turns out to be HUUUGE. There are three artefacts to be found inside this sprawling yet claustrophobic environment of white cubes, but make sure you've got your speakers turned up, as it's the sound that really gives the game an eerie feel.

I'm still trying to find all three of the artefacts, although the chances of me escaping from this place afterwards are pretty slim! The game can be played on both PC and Mac. Download from increpare's site.