The Hacker's Sandbox is a free interactive hacking simulation
It features an advanced and scriptable gaming engine which is extendable using Lua Script. You can create your own playable mission-packs to share with your friends or the community. Custom mission packs can even be used as learning tools!
Downloads
Download the latest binaries for your platform to play the game. Currently, we have builds for Windows, OSX, and Linux! All free to play.
Documentation
Before you start writing your own mission-packs, grab a copy of the docs. This is supplimental material to your standard Lua scripting, and should be all of the information you need to get started. As an added bonus, the default mission-pack is now in plain-text, making it easier to hack apart and learn from.