Simply one of the best SNES games
-Spin Jump (Mario spinning while he is jumping-->with this he can defeat thougher enemies with one jump and break blocks)
-Flower (Mario can project fireballs)
-Feather (Mario gain a cape, and he can fly)
-Mario can exit from the level without completing it.
-Yoshi (green, red, yellow and blue colored): Yoshi is a dinosaur Mario can ride.Upon eating a shell of any color, blue Yoshis can fly, red Yoshis can spit fire, and yellow Yoshis stomp the ground, hurting nearby enemies. A yellow shell that has been entered by a Koopa becomes multicolored, allowing Yoshis of any color to fly, stomp, and spit fire all in one. There are also Baby Yoshis in the Star World levels which can be picked up by Mario. After eating five enemies or any power-up, they will become a fully grown Yoshi of the same color.
-Mario is able to pick up things(for example Koopa shell) and throw it (he can also throw it above)
The music was composed by Koji Kondo and I think it's pretty good. Some of the musics are the same, but in different style (faster or slower...).
The end of the game is original. You save the princess by defeating Bowser and then you all go home.
If you want to spend your time with a SNES game, I really recommend this one.