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Are you sure? I can point out a few inaccuracies and grammar mistakes:

Calvin "touched" the "Pernicious Poem Place", he didn't "land on" it

The "Bonus Box" should have the "B"s in bold

The rule about the black masks is repeated

This line: "Although all games of Calvinball are different, (you make up the rules as you go), many of them seem to involve a volleyball (the Calvinball), masks, and pickets with numbers printed on them." has too many commas and parentheses

Etc.

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