Super Mario Bros. X is a massive project that blends elements from Super Mario 1, 2, 3, and World. It has many power ups, such as the Hammer Suit, Tanooki Suit, Kuribo's shoe, The Billy Gun, and many old and new Yoshis. You can also play the game with a friend in the 2 player co-op mode, were the screen seamlessly splits and combines as the players separate and rejoin. This game is most notable for it's extensive editor that allows you to create almost any kind of level that you can imagine. The real time editor even lets you edit the level while playing it.
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