Reference project

libGDX

Java framework for 2D/3D games across desktop, Android, iOS and browser targets.

Why we recommend it

libGDX gives a Java team rendering, input and game-oriented tools while leaving application structure under its control. Shared game code can be paired with platform-specific launchers and services.

When to choose it

Java-based 2D games and custom multi-platform game architectures.
Teams that want shared gameplay with explicit platform modules.

What to consider

It is a framework, not an integrated visual game editor. Your screens, game model and asset pipeline still require design.
Platform backends need different toolchains and may restrict Java APIs. Verify the chosen modules on each target instead of assuming a desktop build proves mobile or web support.

Start with this project

Use the official setup tool to create a separate Gradle project with only the required platform modules. Start on desktop, implement a screen and input, manage assets, then build the same slice for the next promised target.