Codename One Game Builder Tutorial Lets Developers Build 2D Platformers Visually

A new tutorial series for Codename One's Game Builder tool demonstrates how to create a 2D side-scrolling platformer called Duke's Coffee Run, featuring Java mascot Duke. The Game Builder replaces manual sprite-placement code with a visual editor that saves level designs as small data files, reducing developer code to just game logic and rules. Built on Codename One, an open-source framework that compiles a single Java or Kotlin codebase into iOS, Android, desktop, and web apps, the tool supports visual iteration without recompiling. The first tutorial covers importing real artwork, slicing animated sprite sheets, and understanding core components like scenes, layers, and the generated companion class. Two follow-up tutorials will extend the series to a board game and a 3D dungeon using the same level-file format.