New Super Mario Bros. Wii/World 1-Fortress

Normal strategy
Jump onto the rising platform and hit the ? block to get a power-up and jump onto the next rising platform to the ledge use the swinging platform to reach the the other ledge jump on the moving ledges to reach the next place. Jump onto the swinging platform and from there grab the star coin or jump to go on up.

Use the three swinging platforms to go on the either get the star coin or jump to the ledge and continue. After grabbing the flag, go on up and avoid being crushed by the ledges. Hit the roulette block and jump onward. The swinging ledge allows you to hit an invisible block, wall jump the final star coin or just jump on to the last branch of the tower.

Afterwards keep going until you reach the red coin ring, grab the coins and jump the door. Hit the ? block for a Fire Flower. Then go into the door to battle Larry Koopa.

Boss battle: Larry Koopa
He is pretty easy. Just avoid his wand blasts and don't fall down the edges. Stomp him three times to defeat him.

Star Coins

 * Star Coin #1: At the swinging platform with a ? block, jump onto the ledge at the right time to jump up and get the first star coin.
 * Star Coin #2: Shortly after the first star coin, the three swinging platforms lead you to two ledges, jump on the right one, from there wall jump up through the ceiling then jump up to the 2nd star coin.
 * Star Coin #3: The third is a little tricky. At the swinging platform above the roulette block wait for the platform to go to the left, then wall jump up to the other swinging platform. Then, jump to the third and final star coin.

Enemies

 * Dry Bones
 * Boss: Larry Koopa

Items

 * Super Mushroom
 * Ice Flower
 * Fire Flower
 * Roulette Block (Star, 1-Up, Mini Mushroom, Propeller Mushroom, Super Mushroom)
 * 8 Red Coins (collecting them all results in a 1-Up Mushroom or Power-Up)