Mushroom I:

Location: The World That Never Was
Objective: The player has 30 seconds to attack the Heartless 70 times.
Best Method: Use wisdom form! The shot ability allows you to attack the heartless extremely quickly. Also, make sure to take care of the slide dash reaction command against this heartless.

Mushroom II:

Location: Christmas Town
Objective: The player must avoid the enemy attack 80 times.
Best Method: Dodging moves can be tricky, that is, unless you put your abilities to good use. Use moves that dodge or bounce back attacks, we recommend using reflect. If you have levelled up your Limit Form enough, then dodge roll is the best option.

Mushroom III:

Location: Beats's Castle (Outside)
Objective: The player must pick up 450 prizes that the mushroom drops.
Best Method: Use the draw ability to draw in all of the prizes. Then, use a combination of glide and dodge roll to pick up the prizes.

Mushroom IV:

Location: Land of Dragons
Objective: The player must push the heartless 85 times, without getting attacked by it.
Best Method: Your best bet would be either Wisdom or Final Forms, as they both provide ways to distance yourself from the enemy quickly.

Mushroom V:

Location: Agrahbah (Cave of Wonders)
Objective: The player must defeat the recovering enemy in a limited amount of time.
Best Method: Do your best to attack it. Valor form is a safe bet.

Mushroom VI:

Location: Hades Underworld
Objective: The player must defeat the continuously appearing organization members in 45 seconds.
Best Method: Final Form attacks quickly and efficiently.

Mushroom VII:

Location: Twilight Town
Objective: The player must defeat the enemy within 10 seconds.
Best Method: This is where your magic will come to good use. Switch to Wisdom Form and get ready to use Fire of Blizzard.

Mushroom VIII:

Location: Yensid's Tower
Objective: The player must attack the enemy 80 times without letting it touch the ground.
Best Method: Final Form should do the trick.

Mushroom IX:

Location: Radiant Garden
Objective: Attack the enemy enough to make it spin 80 times.
Best Method: This one provides a bit more preparation. First of all, equip the Rumbling Rose Keyblade along with any Minus Combo abilities. Switch to Wisdom Form during the battle.

Mushroom X:

Location: Port Royal
Objective: Find the real enemy and defeat it.
Best Method: Equip as many minus combo abilities as possible to make this significantly easiar.

Mushroom XI:

Location: Timeless River
Objective: Attack the enemy 99 times in 19 seconds.
Best Method: Wisdom Form can attack extremely quickly. Make sure your drive meter is at it's maximum!

Mushroom XII:

Location: Twilight Town
Objective: Defeat 40 heartless in 30 seconds.
Best Method: This one seems tought! First, make sure your drive meter is at it's maximum. Use Wisdom Form and the Shot move to attack them quickly.

Mushroom Showdown:

Location: Radiant Garden
Objective: Once you defeat all 12 Mushroom Heartless, go to Radiant Garden where you fought the 1000 Heartless, and all 12 will appear there.
Best Method: Reaction Command's are your friends in this fight! Upon completetion of this sidequest, the player recieves the Winner's Proof