New Super Mario Bros.: 7-5

The main enemies you'll have to deal with here are Bob-ombs and Bullet Bills. The first Star Coin is overhead, blocked by bricks. Break some bricks as Super Mario or hit the Bob-omb to break some bricks, then bounce off of a Bullet Bill to reach it. If you're Mini Mario, use a Bob-omb to break a stone block over a mini pipe. Take it down to a room with Micro Goombas. The second Star Coin is blocked by a pipe. The item block contains a Mega Mushroom, so get it and use it to push back the pipe and get the Star Coin. You can't leave until the power wears off, so take out the Micro Goombas, then pound the ground to make Goombas appear from the ceiling. Take the pipe back up and you'll reach the midpoint near a few Bill Blasters and item blocks. Go past some more Bill Blasters and blocks and you'll find the third Star Coin between two Bill Blasters. At the end is a Banzai Blaster in front of the regular goal. This takes you to 7-6. Just in front of the Banzai Blaster is a pipe covered with stones. You'll need two Bob-ombs to break through them. Place them where the stones form corners. The pipe will take you to an underground area with coins, then you'll go up another pipe to thre red goal to 7-A.

New Super Mario Bros. Wii 7-5 QSC

In the area past the midgate with 3 Foos standing on parts of rock, a Paragoomba with Microgoombas, and a red Koopa, I got the 3rd Star Coin. I just walked through the rock wall where the first Foo was and found the Star Coin there.

New Super Mario Bros. Wii: 7-5 -- High Chance of Fog

This level brings back the annoying Micro Goombas, which make jumping difficult. Also appearing are fog-making clouds called Foos. I got the first Star Coin and killed some Foos by stomping. I reached the midgate. I used a Helishroom to get the 2nd Star Coin, but lose the Helishroom to a Paragoomba. I lost the Super Shroom to a Koopa and reached the goal.

After the Game Over:
Take 1- I got a Fire Flower and killed some Foos and got the 1st Star Coin. I reached the midgate. I used a P-switch to get the 2nd Star Coin. I lost the Fire Flower to a Koopa, the Super Shroom to a Paragoomba, but got a 1-up at the goal.