Beating 4-4 opens a side path to a pipe on the World Map, which will take you to the World 4 Mystery House. Unlike the previous house, you have 10 total Green Stars you can earn here. As before, to fully complete the Mystery House, you must get all the Green Stars in one full pass, failing a room (or losing a life) will send you back to the start of the gauntlet.
Green Star #1
The first challenge is to use Jump Panels to scale a series of progressively taller cliffs until you reach the last cliff and must vault up to the Green Star.
Green Star #2
Challenge 2 is a simple dash along a hilly path. Avoid the Horned Ant Troopers and reach the star!
Green Star #3
You start the third challenge in front of a Banzai Bill cannon that just fired. Run toward the camera as fast as you can, and around or over the wooden crates. The Green Star is at the center of the path beyond all the obstacles.
Green Star #4
Another straight path to dash through, only now it’s flanked by Spikes, little green lizards who toss large spiked rollers in front of them. You’ll have to use well-timed jumps to get past the rollers they toss and get to the Green Star.
Green Star #5
A narrow, winding, wooden path looks really dangerous, and if you intend to follow it turn by turn, you cannot stop dashing at all. However, you can make this a lot easier on yourself by doing long jumps across the gaps and maintaining a straight route directly at the Green Star.
Green Star #6
A Dash Panel next to where you start this room will launch you down a straight path, with Thwomps above almost the entire route, ready to crush you if you falter even half a step. Don’t miss the last jump to reach the Green Star!
Green Star #7
Challenge 7 starts you on a platform that is swinging like a pendulum, partway across a pit toward another swinging platform, which in turn swings toward a third platform. Beyond the third platform, the Green Star hangs in the air. You cannot miss this jump;, you’ll most likely not have a second chance at the star.
Green Star #8
This path is similar to the one for Green Star # 4, but your enemies here are a swarm of Goombas. Get past them as quickly as you can to retrieve the star.
Green Star #9
Now it’s back to that winding wooden path suspended in the air, except this time, the camera view is from the side, and cannons are firing Cat Bullet Bills at you. The same trick from before works here: long-jump over those gaps to get to the star as fast as possible.
Green Star #10
This last challenge is actually pretty easy to mess up: Two bridges of Donut Blocks separate you and a pair of Spikes on the other side. Their rollers will cause the lifts to fall into the chasm below. You have to be fast enough that you can get within a safe distance to jump from your likely falling platform to safety. Don’t even both fighting the Spikes, just get the Green Star and put an end to this Mystery House!