In Portal 2 Single Player Mode, there are 9 chapters. In the co-op mode, there are 5 chapters. If this helps any, there are 14 chapters in Single player COMBINED with co-op mode.
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There are 26 chapters in Uncharted 2: Among Thieves.
34 Chapters in Uncharted Golden Abyss for the Vita.
21
Uncharted 2 Multiplayer levels have now surpassed 100, but their is no known highest level.
uncharted 1. Boss: Navaro uncharted 2. Boss: Lazaravich uncharted 3. Boss: Talbot