Just download the .tns and transfer it to your Nspire (CAS/NCAS/CX/CX-CAS). This game is written in Nspire-Lua so it requires that you have the OS 3.0 (or later) on your calculator. The latest OS updates are available on TI's Website.
More information about Lua programming on the Nspire : Inspired-Lua
Contact : adrienbertrand @ msn . com