The Sun: "The Witness is set on an island that you are free to explore in any way you want.
Hidden across this strange island are ten areas with a huge number of puzzles stashed within them. Complete seven of these areas and you can unlock a gold structure in the middle of the island for the final, most devious puzzles.
It's all set from the first person point of view, and the music and graphics are beautiful.
Every puzzle — there are around 400 in total — is hidden within the structure of the island and aims to have you scratching your head until it bleeds."