Tetris Attack

Tetris Attack was about saving Yoshi's Island and Yoshi's friends from Bowser and his minions.

History
Bowser has cast a flood on Yoshi's Island along with enchanting all of Yoshi's friends. Yoshi wasn't affected, and he even figured out how to remove the spell.

Yoshi removes the spell cast on all of his friends and they all head into Bowser's hideout; a mountain he had turned into Mount Wickedness. Continuing on in the Cave of Wickedness, Yoshi and friends defeat the minions Bowser had set up and confront Bowser himself, who had recently woken up. After being defeated, Bowser laments on his loss and leaves.

Then Little Yoshi appears, and everyone thinks he's cool. Yoshi makes a speech that him and his friends will protect the peace around Yoshi's Island, and everyone starts playing tag.

Timeline

 * Yoshi is still living on Yoshi’s Island and states “Bowser and his friends are at it once again”, suggesting that Bowser has caused trouble on the island in recent history.
 * Bowser casts a spell on Yoshi’s friends, turning them to his side. Perhaps this is due to his army being diminished during the previous game.
 * In the end, instead of vowing revenge Bowser merely admits defeat, stating “I have been so completely beaten, and by a Yoshi!”, implying that he is done with trying to take over Yoshi’s Island.