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http://www.ancient.eu/Nefertiti/

Around the year 14 of Akhenaten and Nefertiti’s reign, their daughter Mekitaten died in childbirth at the age of 13. An image in relief from the time shows the couple standing over their daughter’s body in mourning. Shortly after this, Nefertiti vanishes from the historical record. There have been many theories offered to explain her abrupt disappearance and, among these are:

1. She fell out of favor with her husband because she could not produce a male heir and so was replaced by Kiya.
2. She abandoned the religion of Aten and was banished by Akhenaten.
3. She committed suicide in grief over the loss of her daughter.
4. She continued to rule under the name of Smenkhkare until her step-son, Tutankhamun, was old enough to assume the throne.

It seems that it was a real game:

https://boardgamegeek.com/images/boardgame/67439/deadly-double

I'd guess that it's a coincidence. I suspect there's some story-spinning around the retelling, for a couple of reasons:

1. The vagueness of the "violent death" of the game's inventor. Omitted information for no good reason (other than the generation of intrigue) is a hallmark of a fabricated story.

2. I find it hard to believe that the FBI wouldn't be able to track down the game, given that at least one person managed to buy it and it still apparently survives today.

78 is a Halloween decoration. Here is another picture of one.

51 is the single cover for Liars - We Fenced Other Gardens With the Bones of Our Own.

More information: This photo was most likely taken in a Colorado cave where his body was found. The year before, he and his wife divorced, and friends claimed he had spent the last month of his life meditating in Boulder's Dorje Dzong temple. In the letter he sent his friends, he claimed that he would be reincarnated. Source: http://news.google.com/newspapers?nid=950&dat=19770602&id=XuMLAAAAIBAJ&sjid=UlgDAAAAIBAJ&pg=3373,288194

This landscape, or one very similar, can be found on Earth, too. Look up Toadstool Park near Chadron, Nebraska. Same stuff, caused by erosion. Interestingly enough, the erosion at Toadstool was a lot of liquid with weak stone. (I'm no geologist, be gentle.) http://www.tripadvisor.com/Attraction_Review-g28948-d269782-Reviews-Toadstool_Geologic_Park-Nebraska.html#photos

The singing voices are remixed vocals from the Opus III song "It's A Fine Day", but the audio's been reversed. You can go to kapwing.com and put in the video address, it'll reverse the video and you can hear what I'm talking about.