New Super Mario Bros./World 2

World 2-1
In the beginning of the level, you will notice that there is a cactus in your path. The easiest way to beat this level is to have a fire flower on you and in reserve. Once past the first two cacti, you will get to the first Star Coin. Just jump over the cactus to get it. After passing a few more cacti, they will get platforms to fly up and down on. Don't let this disturb you, because you're only halfway to the end. After going a little farther, you should see the last Star Coin in plain sight. When you get to the part where you see the pipe, go in and hit the middle block to reveal a switch. Jump over the last cactus to get to the flagpole.