You're right if you're talking about Mario Party. That's about it. Each series receives one or two main games a generation, with some receiving spinoffs as well.
The games and the spinoffs are usually (although not always) different enough from their predecessors to be distinguishable. There's often a "gimmick" involved that changes the gameplay, for instance. But perhaps you'd care to tell us how Majora's Mask and Ocarina of Time are actually the same game?







