While the games play similarly, they offer different themes.
This series of games includes four different slot machines. One example of an intermediate approach can be seen in Dragon Link by Aristocrat.
Because neither of these situations is fully satisfying, some developers have tried to find a middle ground between these extremes. In other cases, there are wide area progressives that are spread over countless slots, offering players huge wins – but, of course, they are very rarely hit. Some slot machines offer jackpots that are specific to them, which tend to be fairly small but reasonably possible to win.