I'd say, if you're over 6'2" you might have height issues on some rides. If you're over 225lbs and have a 40+ waistline, you may have a hard time finding rides to accommodate you.
I think it depends on the ride. If the mechanism cannot close down over you for safety, you won't be able to ride
I was able to ride all the ones I was worried about except for the Catwoman
As a person who is pretty big i will say no there is special ones but most of the big ones are not
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