Kirby Squeak Squad Unlockable: Cake for Collection
Finish the game.

Kirby Squeak Squad Unlockable: Extra Mode
Collect 120 chests in adventure mode.

Kirby Squeak Squad Unlockable: Hidden World
Get all the secret map pieces from each of the other worlds. In the tower, you can get any ability bubble, including the Triple Star Rod.

Kirby Squeak Squad Unlockable: Triple Star
Defeat the boss on area 8.

Kirby Squeak Squad Unlockable: Fire Sword
You must mix fire and sword.

Kirby Squeak Squad Unlockable: Triple Star
Defeat the boss in area 8.

Kirby Squeak Squad Hint - Mix Power Picker
If you have two bubble powers like Wheel and Hammer, and you want to try to get something like Fire, you can drag one bubble on to another bubble back and forth.

If you do it enough you should start seeing different colors around the two bubbles. First you will hear a ring that will keep on getting higher the more you do it.

The first color is red and you get either fire, bomb or sleep powers.

The next color will be blue, and you can get sleep and ice.

Next you will see green, and you can get sleep, bean, and spark powers.

The fourth color is white and you can get cutter, sword, and sleep.

The fifth color is yellow and you get a choice of ninja, animal, and bubble powers.

The last color is irridescent (rainbow) and from that you can get rare powers like metal, ghost, bubble, and hammer.

Kirby Squeak Squad Hint: Power Mixer

To accomplish the following, you must have the Sword Scroll and the Bomb Scroll. After having both items, you can use your DS stylus to drag the following ability bubbles on top of one another to make new items. The following items can therefore be created: