The Front Door is a level in Super Mario World. It can be accessed by the completion of #7 Larry's Castle, or through the Star Road connected from Star World 5 and Valley of Bowser 4 (secondary exit). It is Bowser's Castle in Dinosaur Land. Inside is a bright hallway with four doors-four areas (numbered 1 to 4) for Mario or Luigi to choose from, each door leads to a different area with enemies and obstacles that vary depending on which door was selected.
All four areas then lead to a second bright hallway with another four doors-four more areas (but this time numbered 5 to 8). The obstacles and enemies will again vary on what door is selected.
The last four areas lead to a dark room and a red block that activates a light at the top of the screen; this room is also seen at the beginning of Back Door, with slight alterations. This area has Mechakoopas, and is also the only area in the game where the player can encounter Ninjis. The boss door is found at the end.
Beyond the boss door is the roof of the castle, where the player must fight Bowser in his Koopa Clown Car. In the first stage of the battle, Bowser will fly around the top of the screen, throwing Mechakoopas. The player must kick these upward toward the Koopa Clown Car. After taking 2 hits, the Koopa Clown Car will fly off-screen, and a bunch of fireballs will fall from the sky and the Koopa Clown Car will return. Princess Toadstool will throw a Mushroom to her left. The player may choose whether to take it or not.
Bowser regains control of the Koopa Clown Car, and this time he will then try to hover above Mario/Luigi and drop Big Steelies on them. After throwing two Big Steelies, he will throw two Mechakoopas. Again, the player must kick the Mechakoopas up toward Bowser, and hit him twice. After another round of fireballs (and another Mushroom), Bowser and the Koopa Clown Car will start bouncing on the ground, trying to land on Mario. Eventually, more Mechakoopas are thrown and the player must again kick one into Bowser, defeating him.
A message comes up as Peach kisses Mario (or Luigi): "Mario's (Luigi's) adventure is over. Mario (Luigi), Peach, Yoshi and friends are all going to take a vacation." Four groups of fireworks appear, with the last one being heart-shaped. The screen then begins to show the credits (with Mario walking and Peach riding Yoshi, as the seven Yoshi Eggs follow along) and the list of enemies from the game, complete with pictures.
On a side note, while there is no timer in the SNES version battle, in Super Mario Advance 2, the timer is present.
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