The general Mall is a public area, it does not cost anything to enter. Though you may be hard-pressed to leave without purchasing something from the many outlets. If you're asking about Nickelodeon Universe, an All Day Wristband is $36.99, and a 2 Day Wristband is $49.99. You can pay for Point Passes, which vary between $3.60 - $70.99 (nickelodeonuniverse.com)
Wristbands and restaurants all vary in price... But to get in mall is free
The mall is free. The various ride and the aquarium have different prices
Thanks! Your answer is awaiting moderation.