Cat Birthday Party & Tree House

Retiring soon

Set number

42666-1

Theme

Friends

Year

2025

Pieces

321

Minifigures

2 total (2 distinct designs) · 1 exclusive

Age

6+

Availability

Retail

Packaging

Box

Box size (L × W × H)

7.5 × 10.3 × 2.4 in (19.1 × 26.2 × 6.1 cm)

Model size (L × W × H)

6.3 × 3.9 × 7.1 in (16 × 10 × 18 cm)

Box weight

0.96 lb (0.434 kg)

Retail price

• US $29.99
• Canada CAD $39.99
• UK £24.99
• Europe €29.99

Store prices the store's own offer

Amazon

$26.88 In stock -10% vs retail

Sold and shipped by Amazon.com · Last checked 2026-10-05 13:00:06 UTC · lowest in 30 days $26.88

Back in stock 2026-10-05 (out since 2026-10-01)

View on Amazon

As an Amazon Associate, Stud Ticker earns from qualifying purchases.

Out of stock

• Not in stock since we started checking on 2026-09-27
• Listed at $26.50

Last checked 2026-10-18 05:00:06 UTC

Price drop $27.95 → $26.50 on 2026-10-15

View on Walmart

Current market value

Amazon marketplace: Lowest New $26.50 -12% vs retail

• New21 sellers (Amazon.com and others) · sales rank #6,109 in [{'name': 'Toys & Games', 'url': '/gp/bestsellers/toys-and-games/ref=pd_zg_ts_toys-and-games'}]

cheapest new offer from any seller · updated 2026-10-05 13:00:06 UTC

: Avg. New $28.37 -5% vs retail · Avg. Used $22.30

• New median $29.96 · typical $24.98–$32.12 · 41 listings
• Used median $22.30 · typical $10.99–$33.61 · 2 listings · few listings

asking prices · updated 2026-09-28 23:19:07 UTC

Release date

2025-06-01

Retiring

2026-12-31

Shelf life

1 year and 7 months

Instructions

Book 1 of 2 Book 2 of 2

All 4 instruction PDFs

Minifigures (2)

• 

  Leo - Red Shirt, Yellow Shorts

  fig-016290

  Only in this set
• 

  Paisley - Bright Light Yellow Top, Medium Lavender Skirt

  fig-015754

  In 2 sets

Qty	Image	Part	Name	Color	Sets
1		69902pr0004	Animal, Cat, Kitten Sitting with Yellow Eyes, Dark Pink Tongue Print	Black	In 7 sets
1		87618	Bar 5L with Handle (Friction Ram)	Black	In 92 sets
1		37762	Equipment Candlestick	Black	In 125 sets
1		75c09	Hose Rigid 3mm D. 9L / 7.2cm	Black	In 29 sets
1		32828	Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L	Black	In 470 sets
1		14226c11	String with End Studs 11L Overall	Black	In 153 sets
1		47905	Brick Special 1 x 1 with Studs on 2 Sides	Blue	In 12 sets
1		92410	Cupboard 2 x 3 x 2 with Hollow Studs	Blue	In 18 sets
2		4740	Dish 2 x 2 Inverted [Radar]	Blue	In 26 sets
2		6003	Plate Round Corner 6 x 6	Blue	In 8 sets
1		1745	Plate Special Round 1 x 2 Half Circle with Stud (Jumper)	Blue	In 5 sets
2		18674	Plate Special Round 2 x 2 with Center Stud (Jumper Plate)	Blue	In 39 sets
2		26603	Tile 2 x 3	Blue	In 65 sets
1		51739	Wedge Plate 2 x 4	Blue	In 33 sets
4		53451	Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small	Bright Green	In 4 sets
2		11477	Brick Curved 2 x 1 No Studs [1/2 Bow]	Bright Green	In 28 sets
4		24866	Plant, Flower, Plate Round 1 x 1 with 5 Petals	Bright Green	In 345 sets
2		5058	Plant, Leaves Stacked 4 x 5 x 1 2/3	Bright Green	In 24 sets
4		32607	Plant, Plate 1 x 1 Round with 3 Leaves	Bright Green	In 489 sets
6		37695	Plant, Stem with 3 Leaves and Bottom Pin	Bright Green	In 217 sets
2		3710	Plate 1 x 4	Bright Green	In 46 sets
2		35480	Plate Special 1 x 2 Rounded with 2 Open Studs	Bright Green	In 17 sets
4		65509	Plate Special 2 x 4 with Groove and Two Center Studs (Jumper)	Bright Green	In 41 sets
3		18674	Plate Special Round 2 x 2 with Center Stud (Jumper Plate)	Bright Green	In 98 sets
2		2431	Tile 1 x 4 with Groove	Bright Green	In 64 sets
1		64648	Animal, Fish [Hollow Stud Mouth]	Bright Light Blue	In 77 sets
2		32803	Brick Curved Inverted 2 x 2 x 2/3	Bright Light Blue	In 11 sets
2		54200	Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)	Bright Light Blue	In 34 sets
2		4070	Brick Special 1 x 1 with Headlight	Bright Light Blue	In 16 sets
1		86876	Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder	Bright Light Blue	In 11 sets
3		3005	Brick 1 x 1	Bright Light Orange	In 95 sets
3		3004	Brick 1 x 2	Bright Light Orange	In 148 sets
1		3659	Brick Arch 1 x 4	Bright Light Orange	In 15 sets
2		78666	Brick Curved 2 x 1 with Inverted Cutout	Bright Light Orange	In 10 sets
1		2821	Container Box 2 x 2 x 1 Reinforced Bottom	Bright Light Orange	In 30 sets
1		3068b	Tile 2 x 2 with Groove	Bright Light Orange	In 101 sets
2		24866	Plant, Flower, Plate Round 1 x 1 with 5 Petals	Bright Light Yellow	In 64 sets
1		6900	Wool / Yarn	Bright Light Yellow	In 5 sets
2		15395	Brick Round 2 x 2 Dome Bottom [Open Stud]	Bright Pink	In 5 sets
2		5690	Brick Round 2 x 2 Dome Top with 2 Ears	Bright Pink	In 7 sets
3		2821	Container Box 2 x 2 x 1 Reinforced Bottom	Bright Pink	In 5 sets
4		6141	Plate Round 1 x 1 with Solid Stud	Bright Pink	In 245 sets
3		4032a	Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	Bright Pink	In 28 sets
1		87580	Plate Special 2 x 2 with Groove and Center Stud (Jumper)	Bright Pink	In 54 sets
1		35044	Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout	Bright Pink	In 3 sets
2		3068b	Tile 2 x 2 with Groove	Bright Pink	In 87 sets
3		3005	Brick 1 x 1	Coral	In 20 sets
3		3004	Brick 1 x 2	Coral	In 50 sets
1		6182	Brick Arch 1 x 4 x 2	Coral	In 4 sets
2		78666	Brick Curved 2 x 1 with Inverted Cutout	Coral	Exclusive
2		27925	Tile 2 x 2 Curved, Macaroni	Coral	In 48 sets
1		2652pr0007	Animal, Cat, Chubby with Bright Green Eyes, Light Bluish Grey Fur Print	Dark Bluish Gray	In 3 sets
1		3957b	Antenna 1 x 4 with Flat Top	Dark Orange	In 20 sets
3		3004	Brick 1 x 2	Dark Orange	In 123 sets
1		3002	Brick 2 x 3	Dark Orange	In 13 sets
1		86996	Plate 1 x 1 x 2/3 with Open Stud	Dark Orange	In 59 sets
5		3023	Plate 1 x 2	Dark Orange	In 256 sets
4		18674	Plate Special Round 2 x 2 with Center Stud (Jumper Plate)	Dark Pink	In 116 sets
1		6900	Wool / Yarn	Dark Pink	In 11 sets
1		22885	Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side	Dark Turquoise	In 12 sets
2		3069b	Tile 1 x 2 with Groove	Dark Turquoise	In 145 sets
1		3837	Equipment Shovel [Rounded Handle End]	Flat Silver	In 67 sets
2		88072	Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]	Green	In 36 sets
1		11618	Headwear Accessory Bow with Heart, Long Ribbon and Pin	Lavender	In 56 sets
2		24866	Plant, Flower, Plate Round 1 x 1 with 5 Petals	Lavender	In 127 sets
1		18853	Plant, Flower with 5 Pointed Petals and Pin	Light Aqua	In 9 sets
1		3021	Plate 2 x 3	Light Aqua	In 30 sets
2		3069bpr9932	Tile 1 x 2 with Cat Food Box, Cat, White 'MEOW BITS' Print	Light Aqua	In 7 sets
1		3022	Plate 2 x 2	Light Bluish Gray	In 1,371 sets
3		57585	Technic Axle Connector Hub with 3 Axles at 120°	Light Bluish Gray	In 190 sets
1		4274	Technic Pin 1/2 without Friction Ridges	Light Bluish Gray	In 1,245 sets
1		6913	Headwear Accessory Hat with Small Pin, Cap	Lime	In 9 sets
8		2423	Plant, Leaves 4 x 3	Lime	In 99 sets
3		5058	Plant, Leaves Stacked 4 x 5 x 1 2/3	Lime	In 2 sets
2		3033	Plate 6 x 10	Lime	In 13 sets
1		6003	Plate Round Corner 6 x 6	Lime	In 42 sets
1		41948	Plate 8 x 8 with Rounded End	Magenta	In 6 sets
5		3005	Brick 1 x 1	Medium Azure	In 131 sets
2		3010	Brick 1 x 4	Medium Azure	In 124 sets
1		15254	Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version]	Medium Azure	In 9 sets
2		18653	Brick Curved 1 x 3 x 2 Inverted [Inside Bow]	Medium Azure	In 18 sets
3		4477	Plate 1 x 10	Medium Azure	In 22 sets
2		4032a	Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	Medium Azure	In 155 sets
5		87580	Plate Special 2 x 2 with Groove and Center Stud (Jumper)	Medium Azure	In 143 sets
4		3069b	Tile 1 x 2 with Groove	Medium Azure	In 241 sets
2		1748	Tile Round 1 x 2 Half Circle	Medium Azure	In 35 sets
1		11602pr0010	Animal, Cat, Sitting with Dark Brown Stripes, White Chest, Ears Print	Medium Brown	In 5 sets
2		5904	Plant, Flower, Peony Rose with 2 Layers	Medium Lavender	In 20 sets
1		3020	Plate 2 x 4	Medium Lavender	In 111 sets
1		4032a	Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	Medium Nougat	In 102 sets
6		98138pr0056	Tile Round 1 x 1 with Animal Track Print	Medium Nougat	In 100 sets
1		10113040	Sticker Sheet for Set 42666-1	[No Color/Any Color]	Exclusive
1		69902pr0003	Animal, Cat, Kitten Sitting with Open Eyes, White Mouth, Nougat Paws Print	Nougat	In 4 sets
2		3020	Plate 2 x 4	Orange	In 346 sets
1		33322	Headwear Accessory Crown / Tiara	Pearl Gold	In 81 sets
1		24131	Headwear Accessory Hat with Small Pin, Clown / Party with Pin	Pearl Gold	In 16 sets
6		32062	Technic Axle 2 Notched	Red	In 2,234 sets
2		3484	Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]	Reddish Brown	In 88 sets
2		78258	Bar 2L with Stop in Center	Reddish Brown	In 114 sets
1		23443	Bar Holder with Hole and Bar Handle	Reddish Brown	In 49 sets
1		3298	Brick Sloped 33° 3 x 2	Reddish Brown	In 73 sets
6		37762	Equipment Candlestick	Reddish Brown	In 83 sets
2		24122	Large Figure Weapon Lightsaber Hilt with Axle Hole and Two Bar Holders	Reddish Brown	In 47 sets
1		53119	Plate Round 1 x 1 Swirled Top / Poo	Reddish Brown	In 103 sets
1		78256	Plate Special 1 x 2 with Clip Vertical on End	Reddish Brown	In 29 sets
1		3700	Technic Brick 1 x 2 [1 Pin Hole]	Reddish Brown	In 276 sets
4		78258	Bar 2L with Stop in Center	Tan	In 51 sets
2		14395	Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]	Tan	In 38 sets
2		37352	Brick Curved 1 x 2 x 1 No Studs	Tan	In 51 sets
6		25214	Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end	Tan	In 7 sets
3		2877	Brick Special 1 x 2 with Grille	Tan	In 67 sets
6		59900	Cone 1 x 1 [Top Groove]	Tan	In 194 sets
3		6259	Cylinder Half 2 x 4 x 4	Tan	In 8 sets
1		35480	Plate Special 1 x 2 Rounded with 2 Open Studs	Tan	In 229 sets
4		88072	Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]	Tan	In 88 sets
3		32028	Plate Special 1 x 2 with Door Rail	Tan	In 110 sets
1		71752	Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale)	Tan	In 132 sets
6		59443	Technic Axle Connector Smooth [with x Hole + Orientation]	Tan	In 26 sets
1		59900	Cone 1 x 1 [Top Groove]	Trans-Light Blue	In 110 sets
1		4740	Dish 2 x 2 Inverted [Radar]	Trans-Light Blue	In 157 sets
1		6141	Plate Round 1 x 1 with Solid Stud	Trans-Light Blue	In 624 sets
1		37775	Wave / Flame Small with Pin	Trans-Orange	In 366 sets
1		98138	Tile Round 1 x 1	Trans-Yellow	In 325 sets
1		2652pr0003	Animal, Cat, Chubby with orange Face, Toes, Medium Blue/Lime Eyes Print	White	In 2 sets
1		78258	Bar 2L with Stop in Center	White	In 122 sets
2		30374	Bar 4L (Lightsaber Blade / Wand)	White	In 223 sets
2		11090	Bar Holder with Clip	White	In 116 sets
2		3622	Brick 1 x 3	White	In 931 sets
3		80326	Flag 2 x 2 Square, Flared Clip Edge [Thick Clips]	White	In 33 sets
2		87544	Panel 1 x 2 x 3 [Side Supports / Hollow Studs]	White	In 103 sets
1		11476	Plate Special 1 x 2 with Clip Horizontal on Side	White	In 265 sets
2		98138pr0008	Tile Round 1 x 1 with Offset Black Eye Print	White	In 358 sets
1		27448	Turntable 2 x 2 Female	White	In 117 sets
1		60594	Window 1 x 4 x 3 without Shutter Tabs	White	In 170 sets
1		87081	Brick Round 4 x 4 Centre Hole	Yellow	In 6 sets
1		87580	Plate Special 2 x 2 with Groove and Center Stud (Jumper)	Yellow	In 172 sets
1		35044	Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout	Yellow	In 6 sets
25		32607	Plant, Plate 1 x 1 Round with 3 Leaves	Yellowish Green	In 13 sets
1		32828	Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L	Black	In 470 sets	extra
1		14226c11	String with End Studs 11L Overall	Black	In 153 sets	extra
1		53451	Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small	Bright Green	In 4 sets	extra
1		24866	Plant, Flower, Plate Round 1 x 1 with 5 Petals	Bright Green	In 345 sets	extra
1		37695	Plant, Stem with 3 Leaves and Bottom Pin	Bright Green	In 217 sets	extra
1		54200	Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)	Bright Light Blue	In 34 sets	extra
1		24866	Plant, Flower, Plate Round 1 x 1 with 5 Petals	Bright Light Yellow	In 64 sets	extra
1		6141	Plate Round 1 x 1 with Solid Stud	Bright Pink	In 245 sets	extra
1		3957b	Antenna 1 x 4 with Flat Top	Dark Orange	In 20 sets	extra
1		11618	Headwear Accessory Bow with Heart, Long Ribbon and Pin	Lavender	In 56 sets	extra
1		24866	Plant, Flower, Plate Round 1 x 1 with 5 Petals	Lavender	In 127 sets	extra
2		18853	Plant, Flower with 5 Pointed Petals and Pin	Light Aqua	In 9 sets	extra
1		4274	Technic Pin 1/2 without Friction Ridges	Light Bluish Gray	In 1,245 sets	extra
1		6913	Headwear Accessory Hat with Small Pin, Cap	Lime	In 9 sets	extra
1		1748	Tile Round 1 x 2 Half Circle	Medium Azure	In 35 sets	extra
1		98138pr0056	Tile Round 1 x 1 with Animal Track Print	Medium Nougat	In 100 sets	extra
1		33322	Headwear Accessory Crown / Tiara	Pearl Gold	In 81 sets	extra
1		78258	Bar 2L with Stop in Center	Reddish Brown	In 114 sets	extra
1		53119	Plate Round 1 x 1 Swirled Top / Poo	Reddish Brown	In 103 sets	extra
1		78258	Bar 2L with Stop in Center	Tan	In 51 sets	extra
1		6141	Plate Round 1 x 1 with Solid Stud	Trans-Light Blue	In 624 sets	extra
1		37775	Wave / Flame Small with Pin	Trans-Orange	In 366 sets	extra
1		98138	Tile Round 1 x 1	Trans-Yellow	In 325 sets	extra
1		78258	Bar 2L with Stop in Center	White	In 122 sets	extra
1		98138pr0008	Tile Round 1 x 1 with Offset Black Eye Print	White	In 358 sets	extra

Building instructions

• BI 3101, 32, 42666 1/2 V29
• BI 3106, 80+4, 42666 2/2 V29
• BI 3101, 32, 42666 1/2 V39
• BI 3106, 80+4, 42666 2/2 V39

PDFs from LEGO.com. The same booklet is often printed in several versions (e.g. V29 EU A4 format, V39 US Letter format).