It would be impressive on its own how well this handheld version replicates the basic gameplay of Mario Tennis for the N64, but the game also has a whole elaborate tennis RPG that gives the game a lot of single player value. It's a really cool thing, and makes a lot of sense for a portable version where you might not be able to get a group together and play multiplayer as easily as on the N64. That said, it's a bit slow for my tastes and I didn't get super far in. It's still super cool though!