Senet
Senet is one of the oldest known board games. Fragmentary boards that could be senet have been found in First Dynasty burials in Egypt, c. 3100 BC. A hieroglyph resembling a senet board appears in the tomb of Merknera (3300–2700 BC). The first unequivocal painting of this ancient game is from the Third Dynasty tomb of Hesy (c. 2686–2613 BC). People are depicted playing senet in a painting in the tomb of Rashepes, as well as from other tombs of the Fifth and Sixth Dynasties (c. 2500 BC). The oldest intact senet boards date to the Middle Kingdom, but graffiti on Fifth and Sixth Dynasty monuments could date as early as the Old Kingdom.
At least by the time of the New Kingdom in Egypt (1550–1077 BC), senet was conceived as a representation of the journey of the ka (the vital spark) to the afterlife. This connection is made in the Great Game Text, which appears in a number of papyri, as well as the appearance of markings of religious significance on senet boards themselves. The game is also referred to in chapter XVII of the "Book of the Dead".
Lexiko
In 1931, Butts wrote a paper entitled "Study of Games." In his paper, he described three categories of games: board, number games using playing cards or dice, and letter games (or games that fell into more than one). He noted that, although the most popular games were of the first two (e.g. Chess and Backgammon), the best letter game readily available was Anagrams. Around that time, he was reading "The Gold Bug" by Edgar Allan Poe and noticed a line containing the English letter distribution. This gave him an epiphany: Anagrams would be more fun if the most common letters in English were more common in the game. He carefully analyzed letter frequencies in newspapers and other printed works to determine the ideal letter distribution for the game. With a few other changes, he named his project "Lexiko". The game design was rejected by games manufacturers such as Parker Brothers and Milton Bradley, but Butts was able to sell copies on his own, though not enough to recoup his development expenses. In 1938, he began work on a board game based on "Lexiko", which he called "Criss-Cross Words", which was eventually renamed "Scrabble".