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All answers having "Children's game" as clue:

3 Character Answers:

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RED

TAG



4 Character Answers:

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ISPY



7 Character Answers:

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HANGMAN



8 Character Answers:

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PEEKABOO

SARDINES



9 Character Answers:

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DODGEBALL

HOPSCOTCH

THELEADER



11 Character Answers:

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HIDEANDSEEK

MERCENARIES

MUMBLETYPEG

NECKANDNECK



12 Character Answers:

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PATRICIACAKE



13 Character Answers:

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POSTMANSKNOCK



14 Character Answers:

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BLINDMANSBLUFF

COPSANDROBBERS



15 Character Answers:

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CHINESECHECKERS

FOLLOWTHELEADER