This is eightball / billiards / pool for the Ti-84+ CE graphing calculator.
Physics are not 100% perfect but are alright considering the limitations.
↑ / ↓ - Rotate cue clockwise / counterclockwise
← / → - Decrease / increase cue power
Arrows move the cue ball on scratch and at the start of a game.
Hold 2nd / Alpha - Increase / decrease rotation and movement speed
Enter - Shoot / ready to shoot
Clear - Save and quit
Delete - Quit without saving