World 2-1

Coin 1 (before checkpoint)

To reach this early coin, just catch a ride on the spewing sand below.

Coin 2 (after checkpoint)

The easiest way to reach this coin is to carefully wall-slide down the short wall section just above the coin, and keep holding left to drop right into the alcove.

Coin 3 (after checkpoint)

This final coin, near the end of the level, is impossible to grab if you're playing by yourself…unless you have the propeller suit. If you do, just fall onto it and propeller out of there! If you're playing multiplayer, simply have any player leap for it, then have them immediately have them turn into a bubble afterward (by tapping "A") to avoid death.