³⁷Most physics engines allow the game designer to precisely set the value of g, but applications developers usually chose approximate values such as 9.81, 9.8 or just 10. Also, the demos and documentation often cite incorrect units such as m∕s, as in the example code of Assemblerbot (2006). Lefky & Gindin (2007) have for example shown that arbitrary values are used in the game series Super Mario Bros. to achieve consistent avatar motions across different consoles.