Super Mario 64 (et DS) : Blue cap (Vanish Cap)
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The blue cap is well hidden, it will first go down and open the door with the key that left Bowser in the first world of Bowser. Then take the underwater (right) to arrive in the room with 2 small stone pillars beyond. Push these pillars with rodeo attacks so that it found under water. The room then empties with all its water and reveals a door. Take it to get to the moats that do not contain water. Go to Mario's right to get to a hole that will take you into the level of the blue cap.

Start by sliding to the left to arrive on the first platform. Look to the left of Mario to see the platform where the second is red piece and jump on it. Then continue in the same direction to jump on the platform with the yellow cube. As you can see, the red coin is much lower in the level, jump on the platform next door.

If you jumped on the platform near the yellow cube, just slide straight down to the third red room. As you can see, the fourth piece red is far enough and it will take a long jump to reach it. Once this fourth piece obtained, finish going down and follow the path to the platforms that go up and down. The fifth piece is quite high, it will be necessary to wait until the last moment to go to take it in jumping on the kind of giant swing.

Let the scales lean a little bit and then run quickly to the other side by making a double jump to chopper the sixth red piece. On the elevator, turn to the left and lower yourself and then go back to recover the 7th red piece and continue to the right for you put in safety. Jump on the big switch to activate all the blue blocks of the world.

Then go break the blue block and take the cap that comes out and run take the eighth red room and cross the grid while you are invisible in order to recover the star.