Under Siege is the second level of Hidden Hills and the forty-seventh level overall of Yoshi's Crafted World. This is one of the only levels in the game, besides boss levels, with no flip side to explore. This level uses mechanics from Skulking Around.
To start, Yoshi must get onto a long, magnetic platform lifted by a magnet. As Yoshi is brought higher up the outside of a skyscraper, more searchlights appear. If Yoshi is caught in the beam of a searchlight, it turns red, and a Li'l Marcher pops out of a hole in the skyscraper. As soon as Yoshi gets onto the long, magnetic platform, he can run to the right edge to find a Smiley Flower. Just after this, near the left edge, there is a Winged Cloud Yoshi can hit to reveal a second Smiley Flower. Next, to the right, is a trail of four Red Coins, then a trail of three regular coins and a 10-Coin on the left.
Once Yoshi reaches the Winged Cloud containing five hearts, the long magnet shakes before the magnet detaches it, dropping it out of sight. Here, Yoshi must board one of the two smaller magnetic platforms. Just above the middle magnet is a hidden Winged Cloud containing another Smiley Flower. To the right, there is a window with a hole in it, where a present box can be seen. This present contains several coins, including one red coin. In the middle is a Winged Timer Cloud between two moving spotlights. Hitting it reveals five apples nearby. If Yoshi can eat all of them in the allotted time, he is rewarded with a Smiley Flower. Yoshi must then board one magnetic platform as the other two drop.
There is a Winged Cloud flying from the background to the foreground. If Yoshi hits it with an egg, it reveals another Smiley Flower which continues to rotate. Once Yoshi makes it past two moving spotlights, the platform he is riding is once again dropped, and he must ride the magnet until he reaches the top of the level. When he does reach the top of the skyscraper, Gusties start to appear. Yoshi can follow them to the left to find one last Smiley Flower, then head right to get to the goal.
Three more Smiley Flowers are awarded for collecting at least 100 coins in the level, completing the level with 20 hearts, and collecting all 20 Red Coins.
Once Yoshi gets off the long magnet, he should hop onto the left magnet. Sprout can soon be spotted in a hole in a window, symmetrical to the present box.