  We consider mis\`{e}re Nim as a normal-play game obtained from Nim by
removing the terminal position. While explicit formulas are known for the
Sprague-Grundy functions of Nim and Welter's game, no explicit formula is known
for that of mis\`{e}re Nim. All three of these games can be considered as
position restrictions of Nim. What are the differences between them? We point
out that Nim and Welter's game are saturated, but mis\`{e}re Nim is not.
Moreover, we present explicit formulas for the Sprague-Grundy functions of
saturations of mis\`{e}re Nim, which are obtained from mis\`{e}re Nim by
adjoining some moves.
