A calculator forum I'm part of (cemetech.net, check 'em out!) was holding a programming contest recently.
The goal was to make a calculator game with the theme "trains".
My initial goal was to make my game in PICO-8 and then port it to the Nspire calculator, which also uses Lua.
I finished the PICO-8 part, but never got it ported :(
You can play the PICO-8 version though :D
There isn't any actual game, it's just a simple train sim.
The controls should be pretty intuitive, you can combine tracks by laying them on top of each other.
EDIT: Updated with smoke!
I ported a game originally for the TI-84+ CSE calculator to PICO-8!
Try to stay alive for as long as possible and climb high as crates fall from the sky.
Left - right and z - x move your character.
Credit goes to Botboy3000