The game notes the bet level is 2, so I’m not sure if this was just configured this way by the Vegas casinos or if that’s the norm for them, but there may be a less expensive version lurking out there somewhere.Įach edition has its premium symbol with a clear background, so that each spin the machine can light it up either red, blue or green. The bet increments I found consistently are 50 credits, with a 27-line game. This is a mechanical reel game with a 3×3 reel set. However, the mechanical 5-reel version has a similar persistent state mechanic to get to the bonus, so that information should be helpful to players with those machines around. There are multiple variations of this mechanic, but today will focus on the mechanical 3-reel version.

With a unique clock feature that slowly fills as you place wagers, it has the ability to tell you how close you are to a guaranteed bonus, something most games can’t promise. The game is still pretty prevalent in Las Vegas, but I don’t see it in too many other places.

One of the earlier persistent state reel games to exist is Konami’s Rock Around the Clock.

What Makes it Special: The closer the clock is to 12, the closer you are to a bonus. Game: Rock Around the Clock (mechanical 3-reel version)

Rock around the clock slot machine game