Hotslot is a one of the best of the Coco 1 and 2 versions of slot machine games. Featuring multi-line slots, and very good animation, it also supported 1-5 coins per pull. It also had a fairly decent set of options to go through (including how easy/hard it was to win, whether you have any control over when the wheels stop, etc.).
Title: Hotslot
Author: Jack and Pegi Tindle
Publisher: Moreton Bay Software
Released: 1985
Requires: Color Computer 1,2,3, 32K RAM, joystick optional.