To make your own games, you need to give the computer easy instructions to follow in a language it can understand – code.

Unknown Worlds, the developer behind Natural Selection 2 (the good game about aliens fighting marines), have done a nice and are giving away their LUA IDE, Decoda, for free in an open source form ...

Will you use it to make Natural Selection 3? Unknown Worlds would probably rather you didn't, but the program should provide a nice foundation for your game, if you know your way around Lua.