Shortly after starting this level, you come across Piranha Plants sleeping inside pots. If you sneak up on them, you can actually pick them up with the Y Button so long as they aren’t awake. You don’t have to do this, but these Piranha Plants eat just about anything in their way, which makes taking on enemies a lot easier if you hold them in front of you.
Green Star #1
The first Green Star appears as a silhouette on the wall. If you run toward the camera at that point, you’ll run down a hidden side corridor that is hiding the star.
Fuzzies are invulnerable to anything short of a Super Star (which you do not have at this point) or a Piranha Plant, which will gobble ’em up.
Stamp
You can get the Stamp after you take a door that changes your perspective on the level, with your chosen hero’s shadow being cast on the wall while you move through the area. You’ll see it under a platform with a Mega Piranha Plant standing guard. You can actually drop into the pits next to the Stamp and destroy the walls blocking you from the item.
Green Star #2
The second Green Star is through a Mystery Box just behind a wall made entirely of Blurkers. You can use the nearby potted Piranha Plant to eat your way through this barrier, or you can just blow into the GamePad microphone to disrupt the whole barrier at once and reach the Mystery Box.
Once in the bonus room, hit the P Switch to reveal the Green Star’s location. You’ll see the light in the room shift to reveal its location.
Green Star #3
After crossing a chasm guarded by more Fuzzies, you see a red door that will take you to the Goal Pole. Ignore this for now! Run down the corridor to the right to see the shadow of Bowser terrifying the helpless Captain Toad. If you run to the foreground and kick over the Bowser Board causing the shadow to appear, Captain Toad rewards you with the third Green Star. Now you can go through the red door and finish this level off! Beating 2-3 grants you access to 2-4 and the first Mystery House of the game.
