I wanted to post it here so we could get some thoughts on it from gamers of all kinds and not solely Grand Theft Auto fans. If you're not familiar with this mystery then let me give a brief summary. At the peak of Mt. Chiliad there is a very mysterious mural which is believed to be a puzzle that can be solved in order to obtain either a flyable UFO and/or a jetpack. A photo of the mural first made it's appearance before the game was even released via leaks. It didn't create a buzz until later when it didn't play a role in the game. There are many people who believe this is Rockstar's gift to everyone who had spent countless hours in their previous games searching for things that didn't even exist, most notably Bigfoot in San Andreas. As of yet the puzzle is still unsolved and many believe there is no puzzle at all and that this is a hint at future DLC. No one really knows for sure but there are a select group of people doing everything they can possibly think of to crack this.
There have been some discoveries that are believed to be linked to this mystery but that's about as far as it goes. At the peak of Chiliad there is an observation deck with telescopes. On the back of the deck is written "Come back when your story is complete." Underneath the deck is a red eye drawn on the ground that resembles the eye at the top of the mural. Located on different parts of the mountain are five strange alien glyphs, which so far are assumed to be the five X's on the mural. There's Rain, Moon, Beam, Eye and Faded. Someone eventually figured out that once you get 100% and return to the peak at 3am during a storm that a UFO will appear. However it cannot be interacted with in any way as if it's a hologram. Two more UFO's were then found. One above a hippie camp in Sandy Shores that resembles the one over Chiliad and then another over Fort Zancudo military base that is far more sinister looking that the other two. These can be interacted with but not damaged as they appear to have a force field around them. If you get to close to them your vehicle will shut down.
No one really knows where to go from here. Myself and my others highly believe that Rockstar has created a very complex puzzle for us to figure out. I know a lot of members here are really smart and have been playing games for years and can hopefully give us a kick in the right direction. Hope was running thin for the last month or so until someone discovered something in the game files that looks like a HUD for a UFO. Now we're back to hunting. Some people are even trying to beat the game to 100% without ever killing a pedestrian because they think the X's represent a choice that needs to be made. There is just too much info and theories that people have to cover in one post so I suggest if you want to help then check out some of the GTA message boards or reddit and read up on some of the ideas. We feel like we're so close but there's a missing link that no one has yet to find. Either there is nothing or Rockstar was able to make a puzzle no one has solved yet.