How do I make a ion program like Fruit Ninja?
I think those are typically done in assembly, which is very different from TI-BASIC. Ion is an assembly language shell, and can be found here. A simple ion program would look like:
.nolist #include "ion.inc" ;Assembly code goes here ;Program data goes here (images, constants, pointers, etc.)
If you don't know assembly, you will want to learn that first. TI83s and 84s use z80 assembly, which can be learned here.
Fire Emblem for TI 83/4+ Progress: Demo: 75% Total: 40% Postponed indefinitely