I’m creating a sandbox simulator for Android that lets players build a complete car from the tiniest piston to the full electronic control system, all rendered in a blocky, Minecraft-like style. Every component should behave realistically: attach a crankshaft incorrectly and the engine won’t start; mis-wire the ECU and sensors will fail. The core I need from you is a mobile-friendly application where users can: • browse a voxel library of individual parts (engine block, pistons, gearbox gears, sensors, wiring, body panels, wheels) • snap pieces together under logical rules and see them animate in real time • power up the vehicle, monitor torque, temperature and electrical load, then test-drive or deliberately break components to watch the physics react Unity, Godot, Unreal or a custom OpenGL/Metal approach are fine as long as the end result performs smoothly on current Android phones and tablets. Touch controls and good GPU optimisation are essential, and I want the project organised in clean, modular code so I can expand the parts catalogue later. Deliverables 1. Complete Android Studio or engine project plus APK 2. Intuitive UI for selecting, rotating and connecting parts 3. Physics layer handling mechanical and electronic interactions at an “advanced parts” level 4. Sample voxel art assets sufficient to showcase the system 5. Short technical guide explaining architecture and how to add new components Acceptance criteria – Runs without crash on Android 11+ devices – A demo four-cylinder car can be built, started, driven and broken within the app – Maintains ≥45 fps on a mid-range device (e.g., Snapdragon 720G) If you’ve shipped mobile physics projects or voxel builders before, I’d love to see them and discuss how we can bring this ambitious simulator to life.