Super Mario and the Sacred Bells

Bowser attacks the Mushroom Kingdom, this time he has so much more power. This enraged Princess Peach, and she thinks that Mario wouldn't be able to take down Bowser this time. However, Toadsworth has a suggestion for them. There is seven sacred bells in each world, and it's believed that once they are rung, Bowser's dark magic will be lost. Mario, Luigi, and Princess Peach decide to search and then ring the bells. But if they want to ring the bells, they'll have to get past Bowser's kids, which are trying to conquer a part of the Mushroom Kingdom.

Résumé

Super Mario and the Sacred Bells is an unofficial Mario fan game.

In this game, Mario, Luigi and Peach must travel the Mushroom Kingdom to ring mystical bells that will rid the kingdom Bowser.
This game includes:
8 different worlds
27 different levels
9 bosses(7 of which are the koopalings who are fought in a unique way)
4 power-ups
the ability to ride Yoshi
and more!