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. Collectors browsing Friends sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. 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 · ×4 · Tan -
Bar 2L with Stop in Center78258 · ×2 · Reddish Brown -
Bar 2L with Stop in Center78258 · ×1 · White -
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 · ×3 · Coral -
Brick 1 x 13005 · ×3 · Bright Light Orange -
Brick 1 x 13005 · ×5 · Medium Azure -
Brick 1 x 23004 · ×3 · Bright Light Orange -
Brick 1 x 23004 · ×3 · Dark Orange -
Brick 1 x 23004 · ×3 · Coral -
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 · ×1 · Trans-Light Blue -
Cone 1 x 1 [Top Groove]59900 · ×6 · Tan -
Container Box 2 x 2 x 1 Reinforced Bottom2821 · ×1 · Bright Light Orange -
Container Box 2 x 2 x 1 Reinforced Bottom2821 · ×3 · Bright Pink -
Cupboard 2 x 3 x 2 with Hollow Studs92410 · ×1 · Blue -
Cylinder Half 2 x 4 x 46259 · ×3 · Tan