There are 30 castle secret stars in Super Mario 64 ds.1.? switch red coins.[14 stars and mario needed].2.princess's secret slide[1 star needed]{part 1:make it to the end of the slide and hit the box.]3:princess's secret slide[1 star needed][part 2 :clear slide in less then 21 seconds]4.sunshine isles[1 star needed]5.courtyard's red coins[5 stars and mario,luigi,or wario needed]6.secret of the battle fort[one of the three men needed]7.goomboss battle red coins[8 stars and all heroes needed]8.goomboss battle star switch[8 stars and mario needed.]9.big boo battle red coins[at least 18 stars and mario and wario needed.]10.big boo battle secret room[at least 18 stars and luigi needed]11.secret aquariam[3 stars needed]12.bowser in the dark world red coins[12 stars needed]13.bowser in the dark world star switch[12 stars needed]14.toad's gift part 1[he is in the room with hazy mazy cave]15.behind the waterfall star in the sky[mario needed]16.behind the waterfall's red coins[wario needed]17 under the moat red coins[wario and luigi needed]18.under the moat star switch[wario and mario needed]19.bowser in the fire sea red coins[30 stars needed]20.bowser in the fire sea star switch[30 stars needed]21.on the other side of the mirror[luigi needed]22.chief chilly battle red coins[luigi and mario needed]23.chief chilly battle inside the black block[luigi and wario needed]24.toad's gift part 2[he is around the stair set wall near wet dry world][not the one right next to the painting]25.toad's gift part 3[he is near tick tock clock]26.glowing rabbit hunt[at least 60 stars needed][catch 8 white, glowing bunnies to get the key to the empty room next to wario's][they will only replace the bunnies you have caught.[talk to toad in the rec room to make the 28 bunnies appear]27.over the rainbows inside the block[mario and wario and the cannon needed]28.over the rainbows red coins[mario and the cannon needed]29.bowser in the sky red coins[80 stars needed]30.bowser in the sky star switch[80 stars needed]The other 120 stars can be done by you.I give you good luck and hope this helps you!I had this from memory because I beat the game and saved all the star in the year of June 2012.
it is not stars it is a world
It's too complicated to explain here, but the following URL will help: http://www.youtube.com/watch?v=Iu9zPfuNnfo
Collect 120 stars
When Mario repairs the castle with the star that bowser gave him peach comes. she says "Mario! the power of the stars has repaired to the castle. And it's all thanks to you. thankyou Mario." then peach kisses Mario and bakes him a cake like she promised. and when you get 120 stars go ontop of the castle, talk to Yoshi and he gives you 100 lives.
Waluigi isn't in that game. The cannon in the castle grounds is unlocked with 150 stars.
There are 35.(+the 100 coins in each 15 stages)
If you are talking about the original 64 game, there are only 120 stars. If you are talking about the DS version, you are probably missing the secret stars you get when you collect 100 coins in a level, and some of the castle secret stars.
it is not stars it is a world
You beat the game
To get on the castle roof of the castle
In all the levels, and in the castle hidden.
You can't.
It's too complicated to explain here, but the following URL will help: http://www.youtube.com/watch?v=Iu9zPfuNnfo
Get all 150 stars.
Collect 120 stars
When Mario repairs the castle with the star that bowser gave him peach comes. she says "Mario! the power of the stars has repaired to the castle. And it's all thanks to you. thankyou Mario." then peach kisses Mario and bakes him a cake like she promised. and when you get 120 stars go ontop of the castle, talk to Yoshi and he gives you 100 lives.
Go to youtube and see how to pass the stars, ok