For PC, the gold standard is or FreeJ2ME . However, the most user-friendly for Windows is J2ME Loader (available via its GitHub or as a portable Windows app).
Among the various screen resolutions available, the became a fan favorite due to its tight performance and nostalgic pixel art. If you want to relive this retro classic today, you do not need an old Nokia or Sony Ericsson phone. You can easily emulate and play the Java Iron Man 3 game directly on your PC. What is Iron Man 3 Java (176x220)?