The end of the week is nigh upon us, so it's time for another free app of the week on the App Store. This week, you can pick up one of the most highly regarded mobile games ever, Monument Valley.

If you're unfamiliar with Monument Valley, the game tasks you with guiding a princess named Ida through puzzles made up of surreal architecture. You'll explore a beautiful minimalist world, twisting and manipulating the architecture around you to conquer optical illusions and find hidden paths. All the while, you'll have to deal with the mysterious Crow People, plotting your movements to keep them from blocking your path.

Monument Valley will be free on the App Store through December 10, and it's definitely worth a go if you haven't already checked the game out.