Over at The Morning News a few years ago, the Non-Expert provided a walkthrough of the IKEA adventure game:
IKEA is a fully immersive, 3D environmental adventure that allows you to role-play the character of someone who gives a shit about home furnishings. In traversing IKEA, you will experience a meticulously detailed alternate reality filled with garish colors, clear-lacquered birch veneer, and a host of NON-PLAYER CHARACTERS (NPCs) with the glazed looks of the recently anesthetized.
World five is my favorite part.
And if you need a soundtrack while you navigate through Ikea, you could do worse than Jonathan Coulton's song Ikea, available for free download and listening online.