Cat Birthday Party & Tree House (42666-1) is a Friends LEGO set released in 2025 with 321 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. This set includes 2 minifigures and 138 unique part types.
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Building instructions
2 official booklets — read on BrickID
Book 1 of 2 · US Letter Book 2 of 2 · US Letter
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Minifigures in Cat Birthday Party & Tree House
Parts in this set
138 parts · page 1 of 3 · updating…
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Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small53451 · ×4 · Bright Green -
Animal, Cat, Chubby with Bright Green Eyes, Light Bluish Grey Fur print2652pr0007 · ×1 · Dark Bluish Gray -
Animal, Cat, Chubby with orange Face, Toes, Medium Blue/Lime Eyes print2652pr0003 · ×1 · White -
Animal, Cat, Kitten Sitting with Open Eyes, White Mouth, Nougat Paws print69902pr0003 · ×1 · Nougat -
Animal, Cat, Kitten Sitting with Yellow Eyes, Dark Pink Tongue print69902pr0004 · ×1 · Black -
Animal, Cat, Sitting with Dark Brown Stripes, White Chest, Ears print11602pr0010 · ×1 · Medium Brown -
Animal, Fish [Hollow Stud Mouth]64648 · ×1 · Bright Light Blue -
Antenna 1 x 4 with Flat Top3957b · ×1 · Dark Orange -
Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]3484 · ×2 · Reddish Brown -
Bar 2L with Stop in Center78258 · ×2 · Reddish Brown -
Bar 2L with Stop in Center78258 · ×1 · White -
Bar 2L with Stop in Center78258 · ×4 · Tan -
Bar 4L (Lightsaber Blade / Wand)30374 · ×2 · White -
Bar 5L with Handle (Friction Ram)87618 · ×1 · Black -
Bar Holder with Clip11090 · ×2 · White -
Bar Holder with Hole and Bar Handle23443 · ×1 · Reddish Brown -
Brick 1 x 13005 · ×5 · Medium Azure -
Brick 1 x 13005 · ×3 · Coral -
Brick 1 x 13005 · ×3 · Bright Light Orange -
Brick 1 x 23004 · ×3 · Coral -
Brick 1 x 23004 · ×3 · Bright Light Orange -
Brick 1 x 23004 · ×3 · Dark Orange -
Brick 1 x 33622 · ×2 · White -
Brick 1 x 43010 · ×2 · Medium Azure -
Brick 2 x 33002 · ×1 · Dark Orange -
Brick Arch 1 x 3 x 2 Inverted [Inside Bow]18653 · ×2 · Medium Azure -
Brick Arch 1 x 43659 · ×1 · Bright Light Orange -
Brick Arch 1 x 4 x 26182 · ×1 · Coral -
Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]14395 · ×2 · Tan -
Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version]15254 · ×1 · Medium Azure -
Brick Curved 1 x 2 x 1 No Studs37352 · ×2 · Tan -
Brick Curved 2 x 1 with Inverted Cutout78666 · ×2 · Bright Light Orange -
Brick Curved 2 x 1 with Inverted Cutout78666 · ×2 · Coral -
Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end25214 · ×6 · Tan -
Brick Round 2 x 2 Dome Bottom [Open Stud]15395 · ×2 · Bright Pink -
Brick Round 2 x 2 Dome Top with 2 Ears5690 · ×2 · Bright Pink -
Brick Round 4 x 4 Centre Hole87081 · ×1 · Yellow -
Brick Special 1 x 1 with Headlight4070 · ×2 · Bright Light Blue -
Brick Special 1 x 1 with Studs on 2 Sides47905 · ×1 · Blue -
Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder86876 · ×1 · Bright Light Blue -
Brick Special 1 x 2 with Grille2877 · ×3 · Tan -
Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side22885 · ×1 · Dark Turquoise -
Cone 1 x 1 [Top Groove]59900 · ×6 · Tan -
Cone 1 x 1 [Top Groove]59900 · ×1 · Trans-Light Blue -
Container Box 2 x 2 x 1 Reinforced Bottom2821 · ×3 · Bright Pink -
Container Box 2 x 2 x 1 Reinforced Bottom2821 · ×1 · Bright Light Orange -
Cupboard 2 x 3 x 2 with Hollow Studs92410 · ×1 · Blue -
Cylinder Half 2 x 4 x 46259 · ×3 · Tan