World 6-3 (New Super Mario Bros. Wii)
World 6-3 is the third level of World 6 in New Super Mario Bros. Wii. It is unlocked after completing World 6-1, and its own completion unlocks World 6-. This level appears to be based on World 2-3 from New Super Mario Bros.
In this level, there are Super Piranha Plants, Stalking Piranha Plants, and Buzzy Beetles. The course is a network of Warp Pipes with raising and lowering platforms which the Super Piranha Plants are on top of. Some ? Switchs raise and lower the level of the water.
The level starts on an horizontal Warp Pipe, in front of two other, vertical warp pipes, with one accessible and the other one having a Piranha Plant hiding inside. Once the correct Warp Pipe entered, the player falls from the top of the screen, landing by a ? Switch and, on the other side, a Super Piranha Plant. Once the ? Switch hit, it causes water to raise from off-screen, allowing the characters to go up and get out of the pit they were standing in. The following path is a narrow diagonal path with Buzzy Beetles in it. After that, another Super Piranha Plant is on the way, and has a ? Block above it, which contains a Fire Flower. Then, after another narrow path awaits a third Super Piranha Plant, above of which is the first Star Coin. Then, they have to come across a large room with a ? Switch similar to the previous. Like the other one, it makes water rise from off-screen, and if the player wants the Star Coin they must swim in the passage under the main one in which is a Super Piranha Plant. The player then finds the midway point in a chamber overrun with Buzzy Beetles on the ground and ceiling, and then arrive in an area with multiple Piranha Plants with two sets of Brick Blocks; the player has to wall jump above these blocks to get to the last Star Coin. The last room consists of multiple other Super Piranha Plants, another switch on the upper part of the room, and the Warp Pipe leading to the exit. To reach the Warp Pipe, Mario must go to the upper part of the room, and press the switch to make water rise again. Before the flagpole is a staircase made out of pipes, from which Piranha Plants randomly pop out of.