This is not a good game.
First of all the game had potential, but didn't reach it.
The storyline is Mario, Peach, the old Toad guy, and the Toads go on vacation. But when they get there, Mario is framed by Shadow Mario (a.k.a. Bowser's son). Shadow Mario pollutes the whole island with goop, and the stupid islanders think Mario did it. Now, Mario has to clean the whole island before he can leave, and he has to collect all the Shinesprites. And you guessed it, Shadow Mario kidnapped Peach.
Mario cleans up the goo with FLUDD. A backpack/squirt gun. FLUDD can shoot water, make Mario hover, make Mario turbo run, and make Mario fly like a rocket. Sound fun, right? Wrong. The rocket jumping and turbo running can be difficult and lead to cheap deaths. After a half hour, you get tried of hearing of hearing FLUDD yap. He talks way too much.
The game has some fun levels, but mostly, they are too difficult. The only fun level is when you fight Mechabowser, and that level can also be challenging.
The gameplay can sometimes be whack too.
In some levels, you have to collect 8 red coins. it's a really stupid part of thee game.
The last level, when you fight Bowser is probably the stupidest level in the entire game. Bowser actually talks. And he's voice is gay. The level was very unfun, and lame.
In several levels Mario is on a little boat and you steer by making FLUDD shoot water at the water (or lava) that the boat is in. That is very frustrating!
The one level I really want to talk about is the level when you clean the giant eel's teeth. That was the stupidest and dumbest idea I ever heard of. You go underwater to clean a eel's teeth before it kills you. The teeth are black and you use FLUDD to clean the black stuff off. Say you had to clean an eel's teeth with a squirt gun, there is one problem with that. WATER DON'T SHOOT UNDER WATER! But apparently in the Mario world, it does.
One last thing, Yoshi is in this game. Yoshi is almost no good to you. If he's feet are in water, Yoshi dies. The only good thing Yoshi does is shoot juice at yellow goo.
So, bad gameplay, okay graphics, frustrating puzzles, stupid characters, this game sucks. Mamameia!