It's Kirby Super Star with some more stuff added. The additions are all pretty good from what I remember, mainly some additional hard mode versions of the original game's campaigns with some twists added in. The only downsides of this version of the game is that the music sounds worse and the background graphics are no longer pre-rendered sprites. The redrawn backgrounds just don't have the same evocative look when they are no longer mid-90s CG renders.