There's something about overcoming a massive challenge that adds an excitement level and sense of achievement that is simply not seen in more casual games. This is the reason why Myst was so popular back in the early 90s and why The Room was so popular for the iPhone and iPad.

And yet like all games similar to Myst and The Room, when it's done, it's done. Luckily The Room has spawned The Room 2, The Room 3, and The Room 4, but if you've gone through the sequels and are looking for the next great challenge, here are a few great puzzle games to download.