This is a controversial math game usually played by children in which the players are feudal Japanese butchers who are trying to invent the timeline in order to hoard the most shrunken heads.
(Refresh the page or click the title image for another game!)
by Dave Lartigue (Legomancer on BoardGameGeek)
Thanks to the following BGGers for their help in adding words and phrases: ben_ethus, chaddyboy_2000, derscheid, dodonna, pronoblem
Also check out In This RPG...