Mancala Solitaire, also known as the Mancala-game in the On-Line Encyclopedia of Integer Sequences™ (OEIS™), was invented in 2005 by OStR a.D. Roland Schröder, a retired math teacher in Celle (Germany). He was inspired by Klaus Hasemann's game Türme Bauen (i.e. "Building Towers"), a combinatorial math problem for 1st and 2nd graders. Research on the game's mathematical properties demonstrated that the lower Wythoff sequence can be constructed by playing it. Results were published in the OEIS™. Knott and Schröder also formulated in 2010 two assumptions for a game played on an infinite board.