Super Mario 64/Wet-Dry World

Bob-omb Buddy: Jump in to the painting at the top (you can do this by standing 2 squares away from the painting and backflip in). The Bob-omb buddy is on a platform just above the water level.

Star 1: Shocking Arrow Lifts

Touch the highest switch in the level (straight ahead from where you start, on the 45 degree slope) Swim to where the star is (a yellow block just above water level) and hit it for the star.

OR-------

Lower the water level completely, then go to the stairs with a pyrmid on top and electric ball around it, in one of the indentations is a warp, take it. You should appear a ta a cannon, at the ledge below is a yellow box, pop it for the star

Star 2: Top o' The Town

Go as high as you can and walk across the long plank. The star is on the highest platform.

Star 3: Secrets In The Shallows And The Sky

Find all 5 secret spots. One is behind the block that you push at the very bottom of the level, one is in the yellow box that you can get by standing on the block that you push at the very bottom of the level, one is behind the block you push into a hole near one of the catapolters, one is in the yellow box above the cage with the star in it, and one is in the yellow box on top of the small island that the shocker (Amp) is spinning around.

Star 4: Express Elevator — Hurry Up!!

Get the water all the way down and ground pound the block by the tall thin cage. Get up to the top of the cage and ride the elevator down. Quickly go in and ride it back up to the star.

Star 5: Go To Town For 8 Red Coins

First of all, you have to be Mario. Try to run towards the wet-dry world painting (the one with the picture of the water spider), then jump as high as you can into it. The water level should be high enough for you to jump over the cage in the corner. If you are unable to jump over the edge, the water will be sufficiently high to use the cannon in the opposite corner of the cage entrance to fire yourself up and into the cage. Jump into it and as quick as you can, try to get through the tunnels and into the underwater town. Once you get there, turn around until you see a pyramid that helps lower or raise the water. Get to it as fast as possible! Alternatively if you want to look around for a bit before lowering the water, you can swim up to fresh air first. Now here's where the red coins are:

Where the pyramid statue is are steps up to the small castle building. The first step up is where a box is. All but 1 of the the red coins are hidden in similar boxes. You can break them open by punching or ground pounding them.
Jump further up onto the wall. You'll see 2 brick boxes, one left one right. Ground pound one of them.
On the other side of the wall is another one. Do the same thing.
Look over at the wall again. You will see a little castle with a star shadow in the entryway. Go over to it and jump onto the roof, then use a back flip to reach the coin on the roof.
The next 4 coins are in boxes on the roofs of buildings. Reach the top of the building right across from the opening in the wall by doing wall jumps, or by climbing to the top of the tree farthest in the corner, and jumping there. Jump onto the roof and ground pound/hit the box.
Now go between the two buildings (one is dark brick, one light grey brick) that has boxed grass/slime sitting in the middle. Try jumping up the walls. You will see on the roof of one a box. Ground pound it.
Look at the opposite building's roof. Jump over and ground pound/punch the box on that side.
Go over to the left of the castle. You will see two more walls (white brick and a cage with a ? box in it). Jump up the walls jumping off the cage and the building. On the roof of the white building, you will see a box. Ground pound it.

The star will appear in the entrance of the castle. Go get it to complete this level!

Star 6: Quick Race Through Downtown

Go to the town (see star 5) and get the Vanish Cap and run in to the cage on the other side of the level. Use wall jumps to get to the star at the top. Another way to get the star is once you're in the cage, backflip on to the vanishing cap box and then long jump over to the platform. You can also get the blue vanishing cap and run behind a red tiled roof. You have to quickly run to the cage where there is a brown box and backflip up to the steps.

You can also get this star by finding the Luigi cap. then go to the red ! box to turn invisible and run to the cage. once inside, triple jump to get on the platforms and grab the star.