K'Nex 18515 Mecha Strike Roller Coaster Building Set

K'NEX Thrill Rides - Clock Work Roller Coaster Building Set - 305 Pieces - For Ages 7+ Engineering Education Toy

K'nex Thrill Rides - Cobweb Curse Roller Coaster Building Set - 473Piece - Ages 9+ Construction Educational Toy Building Set

K'NEX Thrill Rides - Panther Attack Roller Coaster Building Set with Ride It! App - 689 Piece - Ages 9+ Building Set

K'NEX Thrill Rides - Space Invasion Roller Coaster Building Set with Ride It! App - 438Piece - Ages 7+ Building Set.

K'NEX Thrill Rides - 3-in-1 Classic Amusement Park Building Set

K'NEX Education - STEM Explorations: Roller Coaster Building Set - 546 Pieces - Ages 8+ Construction Education Toy

K'nex Dragon's Revenge Thrill Coaster - 578 Parts - Roller Coaster Toy - Ages 7 & Up

K'nex Thrill Rides - Tabletop Thrills Shark Attack Roller Coaster Building Set - Ages 7+

K'NEX Thrill Rides - Twisted Lizard Roller Coaster Building Set with Ride It! App - 402 Piece - Ages 7+ Building Set (Amazon Exclusive)

K'NEX Thrill Rides - Bionic Blast Roller Coaster Building Set with Ride It! App - 809Piece - Ages 9+ Building Set