Yoshi's Island (SSBM)
Announced at E3 2001, Yoshi's Island (ヨースター島 Yô sutâ shima) is a starter stage in Super Smash Bros. Melee, also available as a Melee Stage in Super Smash Bros. Brawl. It acts as Yoshi's home stage, and players face Bowser and his teammates on the stage in All-Star mode.
This stage comes from Super Mario World. In Super Mario World, there are yellow boxes with two vertical lines in them. If the player were to hit under a yellow box, the yellow box would spin for a short period of time. When the box is spinning the player is able to go through it. In this stage in Melee and Brawl, there are nine of these yellow boxes. When a player hits or attacks the yellow boxes, the players are able to go through them. In Super Mario World, the player will occasionally come across a diagonal pipe. One of the diagonal pipes is used as cannon for the player to get across a large gap. In this stage, there is a diagonal pipe. There are numerous elements in the background of this stage that are seen in Super Mario World such as round-topped mountains, apple trees, and long rounded clouds. In Super Mario World there are apple trees. When a player is riding on Yoshi, the player can make Yoshi eat the apples from the trees. When Yoshi eats a certain amount of apples, it lays an egg that has a certain item in it. Also in the background of this stage are two enemies from Super Mario World. One of them is a giant Bullet Bill called Banzai Bill. The other enemy is a Fishin' Lakitu with an extra life mushroom. 
There are two music tracks that can be heard on this stage. The first comes from Super Mario World's "Athletic" theme. When the player jumps on Yoshi in Super Mario World a drumbeat can be heard. The drumbeat can be heard in Melee's remix of this track. The alternate track has a mix of two music pieces from Super Mario Bros. 3: the overworld theme and the track that plays when selecting a stage in World 1. 
This stage has a unique design. On the far right of the stage, there is a hill sloping upwards. Characters can go up the hill, but walking too far will result in a self-destruct. On the left, there is a large Warp Pipe supported by two smaller ones. In the center of the stage are 9 Turning Blocks. Six of the blocks are in the air, while three of them are in the middle of the stage, building a bridge. Below the three middle blocks is a pit. If characters attack a block or jump into it from below, the block starts spinning, like in the original Super Mario World. When this happens, characters won't be able to stand on the spinning blocks, and will instead fall down into the pit where it is possible to get trapped, making it somewhat difficult to recover, especially for Ness
In Brawl, playing as Fox, Falco, or Wolf and activating the Landmaster Final Smash when at least one of the three Turning Blocks in the middle rotates causes the Landmaster to fall through the resulting hole, causing a SD, despite the fact that the Landmaster is much bigger than the opening. This is because of a game physic in which the actual character is still on the field and the characters cannot stand in midair. It is believed that the characters are in the direct middle of the Landmaster. If the Landmaster only hangs over the edge a little, it will not fall. The Pokémon Trainer also occasionally moves above the hole, even though there is clearly nothing under him.
 Tournament Legality
In both Melee and Brawl, Yoshi's Island is universally banned due to its terrible stage design for competitive play as well as its advantages it gives to already powerful characters. In both cases, the abnormally close blast lines and the walk off blast line to the right of the stage can easily cause quick KOs; the frequent absence of a bottom blast line also marginalizes edgeguarding skills. Both of the ramps that border this stage also allow Melee Fox players to easily and quickly shine combo characters to an unavoidable KO, giving the already top-tier character yet another obscene advantage.