There are 22 books in The Critter Club Series.
Analysing the books in the series, we estimate that the reading level of The Critter Club Series is Grade 11.
The easiest book in the series is Liz's Night at the Museum (The Critter Club Book 15) at -1th and 0th grade reading level.
The hardest book in the series is Amy the Puppy Whisperer (The Critter Club Book 21) at 12th and 13th grade reading level.
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Other series related to The Critter Club Series are .