Warp Zone (Super Mario Bros. 3)

Warp Zone, also known as World 9, is a world in  Super Mario Bros. 3 .

This world is secret, and is not accessed by clearing World 8. No actual levels exist in this world, and it only serves to skip to another world. The game cannot be saved.

Directions
In order to get to the Warp Zone, the player must use the Warp Whistle. Where the player ends up is dependant on the world he used the Warp Whistle in; using a Warp Whistle while they're already in the Warp Zone leads them to the section leading to World 8.

Geography
The Warp Zone consists of a small island, littered with Warp Pipes leading to other Worlds. Any other geography cannot be defined, due to there being no actual levels.