RBXDev – Home

Creating multiplayer, physics-based games has never been easier. Use our powerful development environment, ROBLOX Studio, to construct your worlds out of simple physical primitives. Snap blocks together or blow them apart. Use motors, hinges, and other joints to build vehicles and other mechatronic assemblies. Script interactions in Lua, a game industry-standard scripting language. Forget about writing boilerplate code to glue all your entities together a networked environment – not necessary. Prototype a multiplayer game in minutes. If you can imagine it, you can create it in ROBLOX.

Source: RBXDev – Home

Lua

Lua is a powerful, fast, lightweight, embeddable scripting language.

Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics. Lua is dynamically typed, runs by interpreting bytecode for a register-based virtual machine, and has automatic memory management with incremental garbage collection, making it ideal for configuration, scripting, and rapid prototyping.

via Lua: about.