Earn the Best Castle
Find all 40 Spritelings before beating the final boss to get the best castle (and best ending).

Unlock Selected 1: Dodge Balls
Collect all eight treasures in Greenhorn Ruins.

Unlock Selected 2: UFO Assist
Collect all eight treasures in Wonky Circus.

Unlock Selected 3: Jumpin' Rope
Collect all eight treasures in Beanstalk Way.

Unlock Selected 4: Munch a Bunch
Collect all eight treasures in Pecan Sands.

Unlock Trial Version 1: Wario Whirled
Collect all eight treasures in Greenhorn Forest.

Unlock Trial Version 2: Heads Up
Collect all eight treasures in Horror Manor.

Unlock Trial Version 3: Gold Digger
Collect all eight treasures in Shivering Mountains.

Unlock Trial Version 4: Lickety-Split
Collect all eight treasures in Mirror Mansion.

Infinite Coins
When fighting DinoMighty, grab her tail and wait until she raises it above her head. Perfom a Ground Pound (A + R Button). She'll drop a lot of coins. This stuns, but does not damage her. Repeat as often as you like to get an inifinite number of coins