Slot machines are the most popular form of casino entertainment, both at land-based and online casinos. The main categories of online slot machines are classic 3-reel slots, 5-reel and 7-reel video slots, interactive i-Slots, and progressive jackpots. This article summarizes five of the newest online slot machines from Rival Gaming software, including Bust A Vault, Fixer Upper, Moonlight Mystery, Psychedelic Sixties, and Spy Game.