World 9-4 (New Super Mario Bros. Wii)

World 9-4 is the fourth level of World 9 in New Super Mario Bros. Wii. This level involves a desert landscape, which has many pipes and auto-scrolls. Most of its enemies are Fire Piranha Plants and Bob-ombs. Its main power-up is an Ice Flower, which is required to get the last Star Coin.

Layout
This level is an auto-scrolling level that takes place in a desert containing many pipes. At the beginning, Mario must progress through various pipes while Fire Piranha Plants and Bob-ombs attempt to stop him. Towards the middle of the level, Mario encounters Switchbacks, which are sensitive to weight. If two entities or more are on the platform, it starts to sink. At the end, Mario finds a pipe that leads him to the Flagpole.

Star Coins

 * Star Coin 1: The first Star Coin is in the area with the first POW Block, on the other side of the small green Warp Pipe. It can simply be jumped to.
 * Star Coin 2: Shortly after the first Star Coin, the second Star Coin is floating right under a green Warp Pipe with a Bob-omb-launching Cannon. Mario and co. must wait for the Cannon to launch a Bob-omb onto the nearby descending Switchback, jump on the platform themselves, let the platform descend enough, then jump up to the Star Coin. It can also be obtained by throwing a Bob-omb at it.
 * Star Coin 3: An Ice Flower is required for this one. Instead of exiting with the usual yellow Warp Pipe, Mario and co. should wait for a Fire Piranha Plant to emerge from the underlying green Warp Pipe, freeze it, then use it to get into the red Warp Pipe directly above. This leads to the third Star Coin.

Enemies

 * Bob-ombs
 * Fire Piranha Plants
 * Cannons