1 Iggy's Castle

#1 Iggy's Castle is the first castle in the game Super Mario World. It introduces crawlable fences to the game as well as lava, which kills instantly upon being touched.

Overview
The castle consists of three rooms, one with crawlable fences, one with a moving screen, and the boss room. The player has 300 seconds on the Timer to complete the level. This level contains no Dragon Coins.

The first room of the first castle is covered in fences, which can be crawled on with the D-Pad. The frence is teeming with Koopa Troopas that will also crawl on the fence. Crawling above and then onto these Koopas will cause a chain in points, so defeating many Koopas will result in many 1-Ups; however, if the player punches the Koopas off the points will not chain. This gate spans above a lava-covered ground, where Podoboos jump from. There are also places in the fence the player can hit to switch sides. There is a Hint Block at the start that gives information on how to use the fences, a P-Switch in the middle that turns Coins to Used Blocks as well as a ? Block that contains a Fire Flower, and a Hint Block at the end that tells the player one of Yoshi's friends is trapped in the castle.

The second room in the castle features a moving screen with a giant wooden pillar smashing onto the ground. It is instant death to be hit by one of these pillars. Turning Blocks help the player cross a gap near the end. Entering the red door at the end of the room will lead to the first boss.

Boss
The first boss in Super Mario World is Bowser's fifth son, the demented Iggy Koopa.

As Mario or Luigi appear in the room, the giant Shell Iggy is standing on will start to tilt from side to side. Iggy will throw balls at the plumber, who must jump over them while hitting Iggy on the head with Jumps or Fireballs. Eventually Iggy will fall into the lava and, with a roar, be defeated.

In the ending sequence, Mario will blow Iggy Koopa's Castle up. A bridge will appear, allowing the player to continue his or her way to Donut Plains.