What size batteries do these toys need? I don't see info anywhere...

You need 2 AA batteries. They last a reasonably long time.

Would this be a good starter set for a very bright nine year old? Can he make his own designs with this set? Will it teach him about engineering?

Yes. My kids had a great time.will teach planning, visualization and engineering skills. May need some adult supervision since some of the directions are very detailed

I'd like to get this but I will also need to get a container to keep all the parts in, any idea how large a container I would need?

If you keep the box like we did you would be able to put every thing back in the box, It does not come with a container. If you need A container you would need about A two to three gallon container

Can the ferris wheel move both clockwise and counterclockwise?

HI there, thank you for your inquiry into the Knex 3-in-1 Amusement Park - the motor will only allow the ferris wheel to spin forward. Hope this helps you! Go to the Basic Fun website for more information if needed. - your friends at Basic Fun

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🎢 Build, spin, and thrill—your amusement park masterpiece awaits!

MOTORIZED MAGIC IN MOTION - Battery-powered motor brings your amusement park to life with dynamic movement.
ENDLESS CREATIVE POSSIBILITIES - 744 pieces empower you to design, build, and customize your own thrilling amusement park.
IMPRESSIVE 3 FOOT FERRIS WHEEL - A show-stopping centerpiece that commands attention and sparks pride.
SKILL BUILDING FUN FOR AGES 9 - Enhances problem-solving, spatial awareness, and critical thinking through play.
BUILD 3 ICONIC RIDES IN ONE SET - Ferris wheel, Swing Ride, and Boom Ride—triple the fun, triple the creativity.

The K'NEX 3-in-1 Classic Amusement Park Building Set features 744 pieces to construct three motorized rides, including a 3-foot tall Ferris wheel. Designed for ages 9+, it combines hands-on creativity with STEM skill development, delivering an engaging and dynamic building experience.

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