Hidden Side consists of 32 sets that ran from 2019 to 2020. Most sets were released in 2020 which accounted for 20 sets. As of today, the average annual growth of sets in Hidden Side is approximately 4.5% per year.
Most valuable LEGO Hidden Side set
70437 Mystery Castle $235.81
Largest LEGO Hidden Side set
70425 Newbury Haunted High School 1,474 pieces
Most owned Hidden Side set
70419 Wrecked Shrimp Boat
The LEGO Hidden Side theme was introduced in the summer of 2019 that was tech influenced and included a storyline and an app game (Apple App Store and Google Play). The theme is focused around the haunted town of Newbury and is designed with an augmented reality (AR) app, allowing users to capture ghosts while solving mysteries within the spooky town.

From the LEGO official description: "Forget what you know – you’ve never experienced LEGO© play like this before. Your phone opens the door to a virtual hidden world where your LEGO© sets come alive in an unfolding ghostly adventure. Solve the mysteries haunting the town of Newbury before it’s too late."
Theme Hidden Side
Year 2020
Pieces / Minifigs 1,035 / 6
Availability Retired
70437 LEGO Hidden Side Mystery Castle
Retail $99.99
Value $235.81
Growth  +135.8%
Annual growth 35.4%
Theme Hidden Side
Year 2020
Pieces / Minifigs 760 / 5
Availability Retired
70436 LEGO Hidden Side Phantom Fire Truck 3000
Retail $59.99
Value $74.58
Growth  +24.3%
Annual growth 3.7%
Theme Hidden Side
Year 2020
Pieces / Minifigs 540 / 5
Availability Retired
70431 LEGO Hidden Side The Lighthouse of Darkness
Retail $49.99
Value $59.19
Growth  +18.4%
Annual growth 3.7%
Theme Hidden Side
Year 2020
Pieces / Minifigs 466 / 5
Availability Retired
70432 LEGO Hidden Side Haunted Fairground
Retail $49.99
Value $59.18
Growth  +18.4%
Annual growth 3.7%
Theme Hidden Side
Year 2020
Pieces / Minifigs 400 / 4
Availability Retired
70435 LEGO Hidden Side Newbury Abandoned Prison
Retail $39.99
Value $63.17
Growth  +58.0%
Annual growth 16.9%
Theme Hidden Side
Year 2020
Pieces / Minifigs 348 / 3
Availability Retired
70430 LEGO Hidden Side Newbury Subway
Retail $29.99
Value $34.95
Growth  +16.5%
Annual growth 5.4%
Theme Hidden Side
Year 2020
Pieces / Minifigs 295 / 3
Availability Retired
70429 LEGO Hidden Side El Fuego's Stunt Plane
Retail $29.99
Value $33.42
Growth  +11.4%
Annual growth 3.8%
Theme Hidden Side
Year 2020
Pieces / Minifigs 244 / 3
Availability Retired
70434 LEGO Hidden Side Supernatural Race Car
Retail $29.99
Value $34.22
Growth  +14.1%
Annual growth 2.5%
Theme Hidden Side
Year 2020
Pieces / Minifigs 224 / 3
Availability Retired
70433 LEGO Hidden Side J.B.'s Submarine
Retail $19.99
Value $23.22
Growth  +16.2%
Annual growth 2.6%
Theme Hidden Side
Year 2020
Pieces / Minifigs 189 / 4
Availability Retired
70427 LEGO Welcome to the Hidden Side
Retail $19.99
Value $22.05
Growth  +10.3%
Annual growth 3.3%
Theme Hidden Side
Year 2020
Pieces / Minifigs 170 / 3
Availability Retired
70428 LEGO Hidden Side Jack's Beach Buggy
Retail $19.99
Value $23.99
Growth  +20.0%
Annual growth 5.3%
Theme Hidden Side
Year 2020
Pieces / Minifigs 134 / 2
Availability Retired
40408 LEGO Hidden Side Drag Racer
promotional
Value $9.14
Annual growth 35.4%
Theme Hidden Side
Year 2020
Pieces / Minifigs 46 / 1
Availability Retired
30464 LEGO Hidden Side El Fuego's Stunt Cannon
Retail $4.99
Value $9.97
Growth  +99.8%
Annual growth 11.0%
Theme Hidden Side
Year 2020
Pieces / Minifigs 40 / 1
Availability Retired
30463 LEGO Hidden Side Chef Enzo's Haunted Hotdogs
Retail $4.99
Value $5.14
Growth  +3.0%
Annual growth 6.3%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2020
Pieces / Minifigs 9 / 1
Availability Retired
792004 LEGO Hidden Side El Fuego
Value $2.26
Annual growth 12.4%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2020
Pieces / Minifigs 9 / 1
Availability Retired
792006 LEGO Hidden Side J.B.
Value $2.77
Annual growth 9.8%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2020
Pieces / Minifigs 4 / 1
Availability Retired
792007 LEGO Hidden Side Worker
Value $7.31
Annual growth 9.2%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2020
Pieces / Minifigs 4 / 1
Availability Retired
792008 LEGO Hidden Side Possessed Mechanic
Value $3.58
Annual growth 5.2%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2020
Pieces / Minifigs 3 / 1
Availability Retired
792005 LEGO Hidden Side Possessed Biker
Value $2.96
Annual growth 12.0%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2020
Pieces / Minifigs 2 / 1
Availability Retired
792009 LEGO Hidden Side Jack and Spencer
Value $2.72
Annual growth 9.5%
Theme Hidden Side
Year 2019
Pieces / Minifigs 1,474 / 8
Availability Retired
70425 LEGO Hidden Side Newbury Haunted High School
Retail $129.99
Value $155.22
Growth  +19.4%
Annual growth 4.7%
Theme Hidden Side
Year 2019
Pieces / Minifigs 698 / 6
Availability Retired
70424 LEGO Hidden Side Ghost Train Express
Retail $89.99
Value $100.00
Growth  +11.1%
Annual growth 2.3%
Theme Hidden Side
Year 2019
Pieces / Minifigs 689 / 5
Availability Retired
70423 LEGO Hidden Side Paranormal Intercept Bus 3000
Retail $59.99
Value $60.85
Growth  +1.4%
Theme Hidden Side
Year 2019
Pieces / Minifigs 579 / 5
Availability Retired
70422 LEGO Hidden Side Shrimp Shack Attack
Retail $49.99
Value $51.17
Growth  +2.4%
Theme Hidden Side
Year 2019
Pieces / Minifigs 428 / 4
Availability Retired
70421 LEGO Hidden Side El Fuego's Stunt Truck
Retail $39.99
Value $36.32
Theme Hidden Side
Year 2019
Pieces / Minifigs 335 / 4
Availability Retired
70420 LEGO Hidden Side Graveyard Mystery
Retail $29.99
Value $32.17
Growth  +7.3%
Annual growth 1.8%
Theme Hidden Side
Year 2019
Pieces / Minifigs 310 / 4
Availability Retired
70419 LEGO Hidden Side Wrecked Shrimp Boat
Retail $29.99
Value $34.93
Growth  +16.5%
Annual growth 4.4%
Theme Hidden Side
Year 2019
Pieces / Minifigs 174 / 3
Availability Retired
70418 LEGO Hidden Side J.B.'s Ghost Lab
Retail $19.99
Value ~$19.99
Theme Hidden Side
Year 2019
Pieces / Minifigs 127 / 1
Availability Retired
40336 LEGO Hidden Side Newbury Juice Bar
promotional
Value $16.06
Annual growth 34.4%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2019
Pieces / Minifigs 4 / 1
Availability Retired
791901 LEGO Hidden Side Jack
Value $2.64
Annual growth 7.2%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2019
Pieces / Minifigs 3 / 1
Availability Retired
791902 LEGO Hidden Side Possessed Pizza Delivery Man
Value $3.21
Annual growth 4.6%
Theme / Subtheme Hidden Side / Magazine Gifts
Year 2019
Pieces / Minifigs 2 / 1
Availability Retired
791903 LEGO Hidden Side Parker
Value $3.47
Annual growth 4.5%