It is worth getting a family card. The price is $20 and gives you a buy 3 get 2 discount for nearly everything on site. My family earned back the cost of the card and still saved money on our first trip. As locals we go to Challenge usually once a month and everytime we go we save even more.
Games are usually $0.75 - $1, miniature golf about $5. Much less expensive then Chuck E Cheese's, but it's easy to lose track of how much you're spending on tokens.
It depends on what activity you choose to partake in.
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