20 Free Cross-Engine Prototype & Starter Projects for Unity, Godot, and Unreal (2026)

Side-by-side 2D platformer implementations covering movement, jumping, and camera in all three engines.
Great for: teaching new hires how level loading and physics differ per engine.

Twin-stick movement, aiming, and basic enemies in three separate projects.
Use it to: compare input systems and camera rigs across engines.

Main menu, options, and save slots wired up using engine-native systems.
Perfect for: teams standardizing how they handle save data across projects.

WASD + mouse look controllers tuned to feel similar in Unity, Godot, and Unreal.
Use it for: FPS prototypes or exploration games where traversal feel matters.

Character controller with orbit camera and basic jump/sprint mapped consistently.
Great for: action-adventure and soulslike experiments.

Simple branching dialogue UI backed by the same JSON data across engines.
Ideal for: narrative-heavy prototypes and visual novels.

Drag-and-drop inventory with hotbar and item tooltips implemented the same way conceptually in each engine.
Use it to: compare UI frameworks and data binding approaches.

Grid movement, turn order, and basic attacks with identical rules across engines.
Perfect for: tactics and strategy prototypes.

Rigidbodies, joints, and simple constraints laid out to highlight differences in physics tuning.
Great for: simulation-heavy and puzzle ideas.

Level select screen and async loading scenes with loading indicators in each engine.
Use it to: standardize boot flows across your projects.

Two-player local co-op project wired for keyboard and gamepads on all three engines.
Perfect for: party game and couch co-op experiments.

Conceptual lobby + ready-up pattern sketched out with links to engine-specific netcode samples.
Use it as: a starting point when planning online multiplayer UIs.

Tiny UI style guide projects showing fonts, buttons, and color tokens in Unity, Godot, and Unreal.
Great for: keeping branding consistent across multiple platforms.