New Super Mario Bros. 2

[Mutsukki]

I don't think playing with Luigi was hard at all. As much as I liked to replay the game as him, that's a really louzy excuse for replayability. Replaying EVERY SINGLE LEVEL to open the last secret one isn't really that great if you don't feel like replaying it in the first place. Also, there could be way more extra stuff in both of these games (although SMG2 has the S world which is really nice~).