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Sets
Exclusive
LEGO Internal
The Mysteries of Play

6471929 The Mysteries of Play

Name: The Mysteries of Play
Brand: LEGO
SKU: 6471929-1
Availability: InStock
Rating: 4.90 (8 reviews)

Images 5

LEGO 6471929 The Mysteries of Play is a Exclusive set currently valued at $100 for new and sealed sets. The set retired in June 2023 with annual appreciation averaging 33.20% since. On the used market, values range from $70 to $97 based on condition. Secondary market prices for new and sealed sets typically fall between $82 and $125.

Set Value (New/Sealed)

This chart represents the current new/sealed value of the set The Mysteries of Play since June 2023. Very high accuracy

LEGO 6471929-1 The Mysteries of Play is an Exclusive (LEGO Internal) set released in 2023, containing 122 pieces and 1 minifigure. It was distributed to LEGO employees for Play Day 2023 and was not sold at retail. The set includes a detective minifigure holding a red-lens magnifying glass, a small tensegrity model that demonstrates balanced tension and compression, and a brick-built puzzle presented in a box. This employee gift set focuses on compact builds highlighting play and problem-solving elements.

A new and sealed The Mysteries of Play is currently valued at around $100, with annual growth of about 22.2% that is expected to level off to around 11.8% in the coming year. The average used price is $87 for those in good overall condition. New and sealed listings currently range from $76 to $125. Based on current trends, this set could be valued near $106 within the next year.

All regions

All regions 10
United States 8
Canada 1

For Sale (New/Sealed)

	(US) The Mysteries of Play Day 6471929 Complete Set, 122 pcs, Box, 18+ (2023)	BrickEconomy Choice $75.00
	(US) Brand new never opened with factory seal	$80.00 -19.7%
	(IE) some wear on edges, ask for photos	$92.54 -7.1%
	(US) Play Day 2023 The Mysteries of Play 6471929 Employee Exclusive w/ Decoder	$100.00 +0.4%
	(CA) box in very good condition	$100.09 +0.5%
	(US) The box may have some signs of shelf wear.	$124.99 +25.5%
	(US) BrickLink store My Kids Love Bricks, LLC	$125.00 +25.5%
	(US) BrickLink store The Corner Brickshop	$125.00 +25.5%
	(US) Mysteries Of Play Exclusive Employee Gift 6471929 NEW Play Day 2023 DECODER	$129.99 +30.5%
	(HU) excellent condition	$151.41 +52.0%

Sales Distribution (Last 90 Days)

This chart shows the distribution of sales for the past three months of new/sealed 6471929 The Mysteries of Play.

Minifigs

The Mysteries of Play contains the following minifigs. All 2 minifigs are exclusive to this set.

gen184

Play Day 2023 Detective Female

Exclusive

Value $8.70

gen175

Play Day 2023 Detective Male

Exclusive

Value $13.43

LEGO Play Day Sets


	6528719 Unplug and Play Play Day 2024 Theme / Subtheme Exclusive / LEGO Internal Year 2024 Pieces / Minifigs 220 / 1 Availability Retired Buy this set at eBay	Value $34.27 Annual growth 34.2% I own this set I want this set

Sets in Exclusive / LEGO Internal


	4000038 LEGO Campus Theme / Subtheme Exclusive / LEGO Internal Year 2022 Pieces 1,494 Availability Retired Buy this set at eBay Bricklink	Value $694.38 Annual growth 31.2% I own this set I want this set

	4000045 Nyiregyhaza Factory 2025 Theme / Subtheme Exclusive / LEGO Internal Year 2025 Pieces 531 Availability Retired Buy this set at eBay Bricklink	Value $117.33 Annual growth 35.2% I own this set I want this set

	4000018 Production Kladno Campus Theme / Subtheme Exclusive / LEGO Internal Year 2015 Pieces 412 Availability Retired Buy this set at eBay	Value $224.66 Annual growth 5.4% I own this set I want this set

	4000023 Jiaxing Factory 2016 Theme / Subtheme Exclusive / LEGO Internal Year 2016 Pieces 407 Availability Retired Buy this set at eBay	Value $310.94 Annual growth 32.4% I own this set I want this set

	4000043 Vietnam Factory 2025 Theme / Subtheme Exclusive / LEGO internal Year 2025 Pieces 346 Availability Retired Buy this set at ebay Bricklink	Value $413.67 Annual growth 35.2% I own this set I want this set

	4000011 Nyiregyhaza Factory Theme / Subtheme Exclusive / LEGO Internal Year 2014 Pieces 327 Availability Retired Buy this set at eBay Bricklink	Value $199.62 Annual growth 22.6% I own this set I want this set

	4000005 Kornmarken Moulding Theme / Subtheme Exclusive / LEGO Internal Year 2012 Pieces 315 Availability Retired Buy this set at ebay Bricklink	Value $430.26 Annual growth 35.4% I own this set I want this set

	4000009 HMV Production Theme / Subtheme Exclusive / LEGO Internal Year 2013 Pieces 285 Availability Retired Buy this set at eBay Bricklink	Value $487.28 Annual growth 30.4% I own this set I want this set

	4000016 Billund Airport Theme / Subtheme Exclusive / LEGO Internal Year 2014 Pieces 281 Availability Retired Buy this set at Amazon eBay Bricklink	Retail $49.00 Value $129.63 Growth +164.6% Annual growth 6.5% I own this set I want this set

	4000006 Production Kladno Campus Theme / Subtheme Exclusive / LEGO Internal Year 2012 Pieces 278 Availability Retired Buy this set at eBay	Value $312.99 Annual growth 5.4% I own this set I want this set

	4000015 LOM Building B Theme / Subtheme Exclusive / LEGO Internal Year 2014 Pieces 215 Availability Retired Buy this set at eBay	Value $497.14 Annual growth 35.4% I own this set I want this set

	4000002 LOM 2011 Moulding Theme / Subtheme Exclusive / LEGO Internal Year 2011 Pieces 174 Availability Retired Buy this set at eBay	Value $4,067.30 Annual growth 38.4% I own this set I want this set

	The Magic of Play Theme / Subtheme Exclusive / LEGO Internal Year 2024 Pieces / Minifigs 113 / 4 Availability Retired Buy this set at Bricklink	Value $3,400.00 Annual growth 35.2% I own this set I want this set

	4000019 Brand Identity and Experience Theme / Subtheme Exclusive / LEGO Internal Year 2014 Pieces 101 Availability Retired Buy this set at Bricklink	Value $481.32 Annual growth 28.7% I own this set I want this set

	4000004 Systematic Creativity Toolbox Theme / Subtheme Exclusive / LEGO Internal Year 2012 Pieces 47 Availability Retired Buy this set at eBay Bricklink	Value $106.33 Annual growth 4.8% I own this set I want this set

	4000036 LEGO Play Day Polybag Theme / Subtheme Exclusive / LEGO Internal Year 2019 Pieces / Minifigs 39 / 5 Availability Retired Buy this set at eBay Bricklink	Value $35.38 Annual growth 35.4% I own this set I want this set

My Collection

I own this set

I want this set

Set Details

Set number

6471929-1

Name

The Mysteries of Play

Theme

Exclusive

Subtheme

LEGO Internal

Year

2023

Released/retired

June 9, 2023

Availability

Retired

Production

20,000

Pieces

122

Minifigs

(All exclusive)

Set Pricing

New/Sealed

Value

$99.60

Annual growth

+33.20% Decreasing

2025 growth

--0.87%

Future growth

+11.80% (2-3 year outlook)

90-day change

1.05%

Used

Value

$86.75

Range

$70.24 - $97.37

Quick Buy

eBay

Buy

Lowest price

$75.00

Highest price

$129.99

Bricklink

Buy

Lowest price

$65.00

Highest price

$151.41

*Listings are for new/sealed sets.

Set Predictions

New/Sealed

Today's value

$99.60

1 year forecast

$106.07+6.49%

5 year forecast

$147.50+48.10%

$143

$151

6471929 The Mysteries of Play is projected to be valued between $143 - $151 within five years.

Insights

Exclusive to an employee Play Day distribution, The Mysteries of Play (2023) is a small, non-retail LEGO Internal release whose one-time handout and unique event minifigure configuration have kept supply tight and collector attention steady, while the lack of a licensed tie-in limits mainstream reach.

Set Facts

The LEGO set "The Mysteries of Play" was distributed exclusively to LEGO employees during Play Day in 2023.
The set features a miniature detective minifigure holding a magnifying glass with a red lens.
It includes a tensegrity model and a brick-built puzzle in a box.
Tensegrity (short for "tensional integrity") is a structural principle where a system maintains its shape through a balance of tension and compression. In a tensegrity structure, rigid components (usually rods or struts) do not touch each other but are held in place by a network of cables or tendons under continuous tension.

The Mysteries of Play Reviews

8 reviews

4.9

Collectors

Investors

Brick Fanatics

“We’re sure that participants will be keeping these tiny mementoes of LEGO Play Day 2023 for themselves, but if any do make it onto the secondhand market, they’re bound to go for a tidy sum. This isn’t the first time that employee gifts have contained unique and sought-after... More elements, with the Star Wars Day gift also including a rare minifigure.”

Full review at www.brickfanatics.com

Subtheme Analysis

Exclusive / LEGO Internal

Sets

Years

2011 - 2025

Annual growth

+14.98% (this set +33.20%)

This set's annual growth (CAGR) vs. subtheme

Community Stats

The Mysteries of Play currently ranks #5 out of the top most owned sets in Exclusive LEGO Internal.

#1LEGO Campus

#2Billund Airport

#3LEGO Play Day Polybag

#4Production Kladno Campus

#5The Mysteries of Play

#6Nyiregyhaza Factory

#7Jiaxing Factory 2016

#8Systematic Creativity Toolbox

About Exclusive LEGO Internal

LEGO Internal Sets are specially produced sets not intended for commercial sale but for internal use within the LEGO Group or as part of specific events or promotional activities. These sets often serve purposes such as employee gifts, event giveaways, or corporate gifts and are generally not available to the public. Examples include sets given to employees during holidays or milestone anniversaries and those created for special events like LEGO conventions or partnerships with other companies. Due to their limited production and unique context, Internal Sets are often highly sought after by collectors.

LEGO Internal currently consists of 18 sets that as of now has run from 2011 to 2025. As of today, 4000002 LOM 2011 Moulding is the most valuable LEGO Internal set with an estimated new/factory sealed value of $4,067.

Set Pricing Models

BrickEconomy uses a number of methods to determine the value of a set.

New/Sealed

Machine Learning/AI Model

Value (today)

$99.60

Value (in a year)

$121.09

Value (in 2 years)

$136.02

Accuracy

0.961100 Very high

Statistical Model

Value (today)

$95.07

Value (in a year)

(Possible plateau)

Value (in two years)

(Possible plateau)

Accuracy

0.355012 Low

Used

Machine Learning/AI Model

Value (today)

$86.75

Value (low range)

$70.24

Value (high range)

$97.37

Accuracy

0.906100 High

To learn more about how we calculate pricing and forecasting, check out our article on BrickEconomy’s Approach to LEGO Pricing and Future Value Predictions.

Region · United States (USD)

Theme · Light

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