Add to Cart
Sign in to turn on 1-Click ordering.
FREE Shipping. Details
Condition: Used: Like New
Add to Cart
Sign in to turn on 1-Click ordering.
More Buying Choices
Add to Cart
+ $9.59 shipping
Sold by: Addit2thecart
Add to Cart
& FREE Shipping. Details
Add to Cart
& FREE Shipping. Details
Sold by: Kidz Kupboard
Have one to sell? Sell on Amazon

Image Unavailable

Image not available for
  • Sorry, this item is not available in
  • Image not available
  • To view this video download Flash Player

K'NEX Atomic Coaster

by K'Nex

List Price: $69.99
Price: $51.66 & FREE Shipping. Details
You Save: $18.33 (26%)
In Stock.
Ships from and sold by Amazon.com.
Want it tomorrow, April 25? Order within and choose One-Day Shipping at checkout. Details
  • Over 800 pieces
  • Coaster soars 4 feet high
  • 37 feet of track
  • Includes 2 coaster cars and motorized chain lift
  • Color-coded instructions, recommended for ages 9+
13 new from $39.93 2 used from $38.70

Frequently Bought Together

K'NEX Atomic Coaster + K'NEX Thrill Rides Supernova Blast Roller Coaster Building Set + K'NEX Thrill Rides Phoenix Fury Roller Coaster Building Set
Price for all three: $139.93

Buy the selected items together

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Product Details

  • Product Dimensions: 17 x 3.2 x 14 inches
  • Shipping Weight: 3.4 pounds (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S.
  • Origin: Made in USA or Imported
  • ASIN: B00857SRVO
  • Item model number: 51441
  • Manufacturer recommended age: 9 years and up
  • Batteries 2 AA batteries required.
  • Amazon Best Sellers Rank: #12,108 in Toys & Games (See Top 100 in Toys & Games)
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (80 customer reviews)
  •  Would you like to give feedback on images?

Product Description


Create your own thrilling roller coaster at home with the K'NEX Atomic Coaster. Standing four feet tall when constructed, this 1,255-piece kit features a motorized chain lift, color-coded building materials, two racing cars, and twisting, turning tracks. The Atomic Coaster combines the rewarding stimulation of building with the thrill of racing and motor power. After you've conquered the Atomic Coaster, its pieces can be reassembled to make another exciting ride called the Proton Plunge.

K'NEX Atomic Coaster
The Atomic Coaster builds over
four feet tall. View larger.

Coaster Stands Four Feet Tall

This exciting K'NEX kit features 1,255 pieces, allowing you to build your Atomic Coaster from the ground up to four feet high. Visual diagrams in the included booklet show you how to connect your K'NEX pieces to steadily transform your coaster from a pile of colored rods and connectors into a towering thrill ride. Once the frame is completed, connect twisting tracks that loop around your structure to create an exhilarating course for your racing cars.

K'NEX Atomic Coaster
Motorized chain lift
View larger.
K'NEX Atomic Coaster
Two coaster cars
View larger.

Motorized Chain Lift

Once your cars have made their way down the coaster, a motorized lift uses chains and pulleys you've built into your Coaster to pull the cars back to the top, where they can begin their rapid descent again. The K'NEX motor runs on two AA batteries (not included).

Rewarding and Stimulating Construction

Like many construction toys, playing with the Atomic Coaster is more about the journey than it is the destination. The real fun here is putting the coaster together, not necessarily what it does once it's completed. Although this product is intended for children ages nine and older, our testers found that this set may be a bit too complicated for children on the young end of that spectrum without some adult help.

The instructions aren't entirely straightforward--the first step in the booklet is actually comprised of a large number of individual steps, many of which require paying close attention to the small visual diagrams and using deductive reasoning to figure out how pieces are aligned. Determining which pieces belong where, based on the diagrams, requires some focused thinking and spatial reasoning. Building the Atomic Coaster properly requires some patience.

Hours of Fun

It took our testers upwards of six hours to fully assemble the Atomic Coaster. The finished product is an impressive sight, and its architect will rightly feel a sense of accomplishment for constructing such an intricate structure. Once assembled, the racing cars lift up the motorized track and zip down the tracks in an endless loop (well, endless as long as you replace the batteries). When you're ready for another challenge, you can use the same pieces to construct another coaster, the Proton Plunge. The instructions for the Proton Plunge can be found on the K'NEX website.

What's in the Box

1,255 K'NEX pieces, two coaster cars, motorized chain lift, and instructions.

Atomic Coaster

At a Glance:

  • Stands over four feet tall when constructed
  • 1,255-piece kit delivers a substantial and stimulating construction experience
  • Motorized chain lift keeps your cars racing hands-free
  • Set can be reassembled into a second unique coaster design

Age/Weight Requirements:

  • Nine years and up

Assembly Requirements:

  • Two AA batteries (not included)

Product Description

Your child can build an atomically cool coaster with dueling action with this play set. With the K'NEX Atomic Coaster Building Set they can use more than 850 K'NEX pieces to create a thrilling roller coaster building experience. Two dueling cars twist, turn and dive as they race through more than 37' of track. The K'NEX Coaster builds over 4' tall and includes a motorized chain lift. Give your child's mind a challenge. With the K'NEX Roller Coaster, your child can construct two different tracks at once and experience the thrill of watching them race against each other in separate courses. Watch your child experience the pride of having built something so intricate. It makes for an exciting gift that can expand the imagination of a child, and it is sure to provide hours of fun.

Customer Questions & Answers

Customer Reviews

Fun to put together, and fun to play with.
Up until then, she enjoyed it so much, and it was a great learning opportunity for her, so I think it's a great toy.
Let me count the ways . . . The easy to follow color coded instructions were not easy to follow at all.
Known as Luvs2Read

Most Helpful Customer Reviews

16 of 16 people found the following review helpful By LMS VINE VOICE on October 23, 2012
Vine Customer Review of Free Product ( What's this? )
This is a very cool and fun toy but it is definitely not an easy one to put together. Usually, age guidelines are usually a few years off so that what says 8 and up really can be enjoyed by younger kids. In this case, the guidelines probably could go the other way. There are a lot of pieces and this will take a while to put together. But boy, what a good learning experience! So tricky to put together, lots of parts, and quite a bit of time but what a cool cool toy.

If you have a kid who likes building things and has quite a bit of patience, this one is definitely a winner! My son was a bit young for this but he loves building things so this one was definitely a hit but, there was definitely a bit of parent involvement (also known as bonding time :)
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
19 of 20 people found the following review helpful By Y. R. Wu TOP 50 REVIEWERVINE VOICE on October 7, 2012
Vine Customer Review of Free Product ( What's this? )
Legos are great for kids in learning directions, spatial orientation, assembly, mechanics, etc. K'Nex allows you do to a LOT more - we have the K'nex Swing Ride- 853 pcs the K'nex Double Ferris Wheel

Although this kit is rated 9+ for age is Our 9 year old had a hard time with some of the tricky parts and I had to pitch in. It's also pretty intimidating in term of the sheer size, so there's that.

I would have given it 5 stars except for the following:

1) Some pictures in the assembly manual are kind of small making it hard to tell what's going on.
2) Some of the track attachment instructions are basically wrong - they work but there are much better ways to connect the track.
3) The tracks are not actually the same on both sides even though they appear to be. The connectors do not hold if snapped on one way, but will hold if the track is flipped over. This is fine with the flat track but you can't always do this with the curved track.
4) Some pieces appeared to be missing in our set - a rare occurrence - our other KNEX kits were perfect on this.
5) I had to tweak the design to get the chain to stay on the track

Overall the kids had a HUGE amount of fun putting this together (as did I). I did end up making one significant change - just before the cars go back onto the chain I swapped the track - the green goes to yellow and the yellow track goes to green. This now means that the ride, instead of being two separate but somewhat identical rides, is now one double length ride.

I will try to add some pictures showing the key changes I made to make the chain stay on as well as to fit the track better.

If you have any questions or comments, or if you found this review helpful, please let me know!
1 Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
18 of 19 people found the following review helpful By heyheyhey on March 18, 2013
My daughter wanted this toy, so I bought it for her this weekend, and it was a miserable experience. First, let me say that I love assembling things. I'm a huge Lego fan, I love Tinkertoys, and had a dozen Capsella sets when I was a kid. The instructions are far too small to be useful. You just cannot make out what the designer wants you to do, except in the broadest strokes. This is very important, because sometimes you'll get 5 or 6 additional steps into the construction and realize that this tiny piece should have been aligned in *this* way as opposed to *that* way, although you cannot tell this from the directions even with a magnifying glass. Yes, I got so frustrated, I brought one out. So you will be going back, unsnapping pieces while praying you don't put enough torque on a part of knock something else out of place. But you will. The sooner you resign yourself to the inevitability of that fate, the better off you'll be. Also, make sure your eye care insurance is paid up, because you will be straining your eyesight for hours.

Additionally, some of the pieces--mainly the tracks--simply resist being placed where the instructions tell you to place them. Even if you do manage to get them in place, the connections are so weak, they'll often snap right out of place with the least pressure. As you can imagine, building a four-foot structure out of hundreds and hundreds of tiny pieces, this happens quite often. I spent five hours on the construction Saturday and was not finished despite being a very fast builder. Two more hours on Sunday, and I finally assembled this fragile monstrosity. So do not get this for anyone with OCD, or you may very well kill them.

Oh wait, no. There were the two tracks to drag the cars up the coaster.
Read more ›
1 Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
11 of 12 people found the following review helpful By Stacey Buffington on January 3, 2013
Verified Purchase
I am 11 years old and I have read a lot of customer reviews on amazon and found out that parents like to say negative things well hears a review from a kid, the atomic coaster was the only thing I wanted for Christmas besides an iPad and I got both and found out that the coaster is better than an ipad it took 9 hours to build (I loved every minute of it) I watched it for like 6 hours and it inspired my to make a whole amusement park around it (I'm currently building Phoenix fury coaster ) and I didn't need any help from parents ( I don't no why so many people complain about helping their child) but some things you need to no are it does not come with batteries in the motor ,I had it all built and then had to tear the top part off to put the batteries in the motor. And another thing is the instructions for the yellow track are totally wrong I had to make up how it goes myself. And the last thing is DON'T LET YOUR CAT NEAR IT several times my cat has knocked it over trying to climb it like King Kong but over all best toy of the year!
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again

Product Images from Customers

Most Recent Customer Reviews



Want to discover more products? You may find many from 12 year old boy gifts shopping list.