|This article contains information that does not coincide with the main series canon.|
|“||Move the Blobs left and right. Press a button to spin the Blobs. Press down to speed their fall. If four of the same color attach to each other, they will explode.”|
|— Tutorial • Kirby's Avalanche|
Blobs are small squishy, jelly-like creatures with two large shiny eyes. They come in five colors: red, yellow, green, blue, and purple. The Blobs will also vary in shape depending on what color they are.
Pairs of colored Blobs drop from the top of the screen. The player must rotate and move the groups before they reach the bottom of the screen or land on the pile, so that matching-colored Blobs touch. When four or more same-colored Blobs connect, they explode, causing any Blobs above them to fall down and fill in the space. If the player manages to set off a chain reaction, an avalanche occurs; Blob-like Boulders fall on the opponent's screen. The number of Boulders that falls depends on both the number of Blobs popped and the number of consecutive chain reactions—up to 36 can be dropped at once. These Boulders can only be destroyed if a player manages to explode a group of Blobs that are in direct contact with the Boulders.
If the third column from the left piles up to the top of the screen, the player who allowed the pileup loses.
- The Blobs did not originally appear in the Kirby series. Kirby's Avalanche is a modified version of the Super Famicom game Super Puyo Puyo; in this game, Blobs are known as Puyos. Blobs also appear in Dr. Robotnik's Mean Bean Machine (where they were called "Beans"), a Sonic the Hedgehog-themed modification of the Sega Genesis version of Puyo Puyo.
- Garbage Blobs are referred to as Boulders in the North American version and Ghosts in the European version, to fit the different regional titles of the game.