The language implemented by LgScript is mostly the same as standard Lua. The differences are:

• Symbol-literal syntax. Where a name is expected, a [ string ] can appear where the value of the string is the symbol name.
  i.e. local ["A variable"] = 9 assigns a number to the variable named ”A variable”.
• Hexadecimal character codes in strings (Backport from 5.2).
• Metatable methods __pairs, __ipairs, and __len (Backport from 5.2).
• Recognize @rem as magic for turning a Lua script into a BAT file.
• Remove the deprecated functions math.mod, string.gfind and table.setn.
• Millisecond resolution for os.time.

And includes bundled modules for the following features:

• Finalizer functions fcall, finalize, finally, onreturn, onerror.
• Add function seq. Returns a sequence of numbers. Takes one, two, or three numeric parameters.
• Add function shift and change the behavior of select. For any list of values A and any integer N, shift(N,A) will return the first N values and select(N+1,A) will return the remaining values.
• Vector type. Adds library function vector and methods vector.mag, vector.norm, vector.dot, vector.cross, vector.new.
• Table library functions extend, merge, reverse, pack, find, keys, values.
• Math library function round.
• Bit32 library backported from 5.2.
• Custom character set that matches the typical Dark Engine fonts.

When running in the game, the io and os libraries are disabled for security.

1. Syntax
2. Types & Values
3. Variables
4. Blocks
   1. If-Then-Else
   2. While
   3. Repeat
   4. For (with numbers)
   5. For (with iterator)
5. Functions
6. Tables
7. Operators
   1. Table
   2. String
   3. Number
   4. Comparison
   5. Boolean
8. Libraries
   1. Standard Library
   2. String Library
   3. Table Library
   4. Math Library
   5. Bit32 Library
   6. io_library
   7. os_library
   8. package_library
   9. coroutine_library
   10. finalizer_library
   11. debug_library
9. metatables, environments, and upvalues