there are 40 story missions in the story mode and more then 60 side missions.
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In one of the story missions, which is taking control of a fort, you have the option to choose either Kuo or Nix to merge your powers. Choose Kuo for the ice powers, and you'll get powers such as Frost Shield, Ice Launch, Ice Grenade, Freeze Rocket and so on.
18
There's no missions in MGS2. Raiden has a mission but that's it.
There are Eight Agency missions and a large number of faction missions.
about 18 levels