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Wythoff quasigroups are a generalization of Wythoff’s game, which in turn is a modification of nim. This paper studies the algebraic structure of Wythoff quasigroups, and in particular the existence of subquasigroups and the question of isomorphism. It is shown that the quasigroups are mutually non-isomorphic, and that there are few possible subquasigroups. The paper concludes with an application to combinatorial games.