Questions and Answers Questions and Answers 1: Q: I can't seem to get the Gravity.lua code to work. Is there anything else I should try? A: A: Make sure you have the luaSDL.dll file somewhere on your system path. If you are using Windows, try this: Open up a command prompt: type cmd or command from the Run option on the Start menu. Navigate to the Gravity directory with the command line: use the cd command to change directories to cd MY DOCUMENTS\BOOK\CHAPTER 7\GRAVITY. Type Lua.exe Gravity.lua 2: Q: Where can I learn more about the Lua API? A: A: Lua-users.org Wiki pages have a few good, short API tutorials: http://lua-users.org/wiki/ There is also an API section in the online 5.0 Lua manual: http://www.lua.org/manual/5.0/