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This site has a bunch of fantastic DIY carnival games and activities. including this simple GUESSING BOOTH.
Backyard Carnival Games for Kids - Sticky Tic Tac Toe game. Throw the ping pong balls and they stick to the board.other variations of tic tac will work too.
The easiest way to make a giant Plinko board for school carnivals or backyard fun. How to make a Plinko board.
Set up cups or jars, and if your guests throw a ping pong ball into one, they win, bottle ring toss