There are a lot of different prices for different things, but adult general admission is $25. Seniors, students and teens (14-17) are $19. Children under 14 are free. If you're looking for a free option, then you can go on Thursday nights between 5pm and 8pm for free (as long as you're a resident of Illinois.)
I think it was $25.00 for general admission, but if you have a student ID or if you're a senior it's $19.00.
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