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71377 King Boo and the Haunted Yard Expansion Set is a Super Mario set that was released in August 1, 2020.


King Boo is the leader of the Boos and ghosts, ruler of the Paranormal Dimension, the main antagonist of the Luigi's Mansion series, and the arch-nemesis of Luigi. He is also an ally of Bowser, who has aided him in his various schemes. He is more than capable of devising and enacting villainous plans by himself, including his capture and imprisonment of Mario. Although not the biggest Boo, King Boo has abilities that far surpass that of the average ghost; he wields a number of impressive magical abilities, including the ability to materialize objects. King Boo's magical power is directly proportional to the number of Boos in his vicinity.


The terrain is the earthiest of the Super Mario sets; the bricks in general make far more use of subdued tones like grey and dark orange, in contrast to the bright primary colours common to the rest of the theme. This set also features a good deal of architecture compared when to the cheaper releases in the theme, sporting a black gate secured between two little stony pillars, and two grey and brown twin towers topped with small black spires. These vacant towers connect to the dark orange nodes by the A-frame connector, one of which holds a tree that Mario can knock over to scan its action tile for five coins. Another node simply holds a couple black weeds, but a larger one has a spiderweb that Mario can overturn by stomping on a black TECHNIC piece, revealing the web’s action tile which he can also scan for five coins. Both action tiles can only be scanned once per round.

The main structure contains some gearing for the TECHNIC bars attached to the house’s left and right sides. The bars support vertical TECHNIC beams that hold up two Swoops on each side. Scanning the action tiles on their backs repeatedly results in a coin bonus with a multiplier effect. The set’s namesake, King Boo, is a large white cube that stems from the structure by means of a couple of toothed bars that are next to a worm gear. A Star Block rests safely underneath King Boo. To dislodge him, Mario has to stomp on the Swoops’ backs. This causes the structure’s machinery to steadily push out King Boo until launching him. After this, Mario can either overlook the Star Block and defeat King Boo with a baker’s half dozen of scans, providing a dozen coins, or scan the Star Block first and defeat him with one scan, providing two dozen coins. The difficulty can be adjusted by the red TECHNIC pin at the back of the structure: pushing it in one direction lets the machinery work faster, whereas pushing it in the other direction delays the machinery but can provide more coins for Mario. Description This is a description taken from Please do not modify it. (visit this item's product page)

LEGO® Super Mario™ fans will love the frightful challenges in this King Boo and the Haunted Yard Expansion Set (71377). A fun gift for kids to add to the LEGO Super Mario Starter Course (71360), this collectible toy features King Boo, 2 Goombas and 4 Swoop figures for action-packed gameplay. To get to the hidden Super Star, players must stomp on Goombas and a spider web, flip a tree and then stomp the spinning Swoops to topple King Boo.

Exciting app
Make building this set even more fun with intuitive Instructions PLUS on the free LEGO Super Mario app. It features digital viewing tools and creative suggestions for alternative ways to build and play and is a safe platform for fans to share ideas.

Limitless gameplay
Perfect for fun competitions with friends or solo gameplay, LEGO Super Mario toy playsets bring a family-favorite character into the real world. The Starter Course, Expansion Sets and Power-Up Packs nurture kids’ problem-solving creativity.

  • Fans can create frightfully fun, stomping, spinning challenges to add to their LEGO® Super Mario™ Starter Course with this action-packed King Boo and the Haunted Yard Expansion Set (71377).
  • This LEGO® Super Mario™ toy playset features 2 Goombas, 4 Swoops and a King Boo for gameplay action as players guide LEGO® Mario™ (figure not included; find in the Starter Course) through the brick-built haunted yard.
  • After defeating the Goombas, stomping on a spider web and flipping a tree to collect digital coins, LEGO® Mario™ (figure not included) must jump on the spinning Swoops until King Boo is toppled to reveal the Super Star.
  • A super birthday or holiday gift for kids aged 8 and up, this 431-piece LEGO® toy playset inspires children to create their own unique levels to add to their Adventures with Mario Starter Course (71360).
  • This modular set measures over 6.5” (17.5cm) high, 16.5” (42.5cm) wide and 10.5” (27.5cm) deep in its basic formation. It can be rearranged and combined with the Starter Course and other Expansion Sets in many ways.
  • No batteries required for this creative building toy – power up the gameplay by adding it to the Starter Course.
  • The free LEGO® Super Mario™ app has cool viewing tools to make building more fun and gives kids a safe platform for sharing creative ideas. For a list of compatible Android and iOS devices, visit
  • Collectible LEGO® Super Mario™ construction toys bring a family-favorite character into the real world, offering fans unlimited ways to expand, rebuild and create new challenges to master in group or solo gameplay.
  • Since 1958, LEGO® building bricks have met the highest industry standards. They connect perfectly and pull apart easily every time, so there’s no need for a Super Star’s power to build or rebuild!
  • LEGO® bricks and pieces are tested in almost every way imaginable so you can be sure that every LEGO toy building set meets the highest safety and quality standards.

Minifigures Included



  • The ‘Haunted Yard’ does not refer to an actual location in the Mario universe, and it is unclear what level if any the set used as its inspiration. However, the Luigi’s Mansion subseries does feature (somewhat) similar levels such as the Courtyard and the Front Yard.

External links