I’m building a mobile sandbox where players shape an infinite, block-based world and jump seamlessly between offline single-player and online sessions with friends. The visual style must mirror classic voxel graphics—simple cubes, bright textures, and chunk-based terrain that instantly signals “Minecraft-like” at a glance. Core scope — One universal phone build (Android first, iOS desirable later) written in a performant game engine such as Unity or Godot. — Procedural world generation with destructible and placeable blocks, day-night cycle, and basic survival needs (health, hunger). — Offline mode that runs entirely on-device plus a lightweight online mode: local Wi-Fi/LAN and simple cloud matchmaking so friends can join the same seed without external servers. — Crafting and inventory management, allowing players to gather resources and erect anything from a tiny hut to a sprawling city. — Touch-optimised controls and a clean UI that stays intuitive for new players. Acceptance criteria • An installable APK that runs smoothly on mid-range devices (30+ FPS on 4-year-old hardware). • A test build demonstrating two phones connected over LAN, sharing the same world with block changes synced in real time. • Source code and project assets delivered in an organised repository with build instructions. • Brief technical document outlining architecture, networking approach, and how future features—biomes, mobs, redstone-style logic—can slot in. I’ll provide sound effects, music, and any additional art you need down the line; for now I need the solid technical foundation and that addictive “place and break” loop perfected. If you’ve shipped voxel or multiplayer mobile titles before, let’s talk timelines and milestones.