As of April 2026, the engine is considered abandoned, but the community still creates content for this specific branch of Super Mario Bros. X. To "prepare a piece" (a level or asset pack), you should focus on these core components: 1. Level Design & Customization GFX Expansion

—and specifically version 1.4.6 —emerged as a "semi-official" bridge between the abandoned original and the fully open-source modern forks. It was an attempt to fix longstanding bugs in the 1.3 era and introduce quality-of-life features without completely rewriting the engine's foundation. For many creators, 1.4.6 became the last "vanilla" experience—the final version of the engine that felt like Redigit’s original vision before the community took it in radical new directions.

Have a question about a specific bug or a hidden feature in SMBX 1.4.6? Check the community wiki at smbx.org (The Codehaus archives) or ask in the SMBX Discord server.