Codename: Kids Next Door - Operation S.T.A.R.T.U.P.

About

Kids Next Door fans get to defend the secret treehouse in this browser-based adventure. Five distinct levels each star a member of Sector V as they tackle a unique villain. Players solve puzzles and complete challenges to stop the breach. Simple controls and a straightforward structure make it easy to jump into. Each level highlights a different character's strengths and quirks. The game’s charm comes from its ties to the show’s humor and teamwork themes. Though over 20 years old, it still holds up as a quick, lighthearted way to relive the KND’s antics.