The Game of Twenty Squares which is also called Royal Game of Ur, is an ancient game with two gameboards found in Iraq in the 1920s. The boards seem date from before 2600 BC, which would make the Royal Game of Ur one of the oldest examples of board gaming equipment found, (Note: some Senet boards may predate it as much as 900 years, jury is till out on that) The Twenty Squares game board may also have been known in Egypt as Assebs. A broken tablet describing the gameplay has allowed the game to be played again after over 2000 years, although the details and rules interpretations have differed widely.
The Royal Game of Ur was played with four tetrahedral dice & two sets of pieces, one black and one white After around 1000 BC, the layout of the twenty squares was altered to make the end course for the markers a straight line. It might have played in Mesopotamia but how is not completely known, though some have tried, based on a cuneiform tablet of Babylonian origin dating from 177–176 BC.
It is pretty much agreed that the Royal Game of Ur, like Senet, was a race game.
Both games may be predecessors to the present-day backgammon, though the structure is quite different.