Setobrick

LEGO part 3688: Brick Sloped 75° 2 x 2 x 2 Quadruple Convex

Bricks Sloped13 colours85 sets

LEGO part LEGO part 3688: Brick Sloped 75° 2 x 2 x 2 Quadruple Convex

Specifications

Reference3688
CategoryBricks Sloped
MaterialABS plastic
Colours13
Sets85
Listed pieces163
First appearance1995
Latest appearance2026
Element (Dark Bluish Gray)4645099
Most common colourDark Bluish Gray
Main themesCastle, Disney, Seasonal
SetopediaData: Rebrickable
Spec sheet updated on 2026-09-29

LEGO part 3688, Brick Sloped 75° 2 x 2 x 2 Quadruple Convex, belongs to the Bricks Sloped category. It exists in 13 colours and appears in 85 sets of our database, from 1995 to 2026, for a total of 163 listed pieces. Its most common colour is Dark Bluish Gray.

Number 3688 identifies the shape and is moulded under the part. Each colour also has its own element ID, the one Pick a Brick uses: in dark bluish gray, it is 4645099.

Part 3688 through the years

The oldest set in our database that contains part 3688 is 6090 Royal Knight's Castle, released in 1995 in the Castle theme. It is still in use: the most recent set featuring it, 43302 Main Street, U.S.A., dates from 2026.

Its peak year is 2025, with 6 sets containing it. The set with the most copies is 10176 Royal King's Castle: 8 copies, against an average of 1.9 per set.

It is spread across several themes, led by Castle (21%), Disney (15%) and Seasonal (9%). With 85 sets, it ranks no. 1,218 of 2,731 parts in our database and no. 62 of 105 in the Bricks Sloped category.

Sets containing part 3688, by period

PeriodSets
1995-19995
2000-200923
2010-201929
2020-202628

Colours of part 3688

2 colours appear in only one set: white (43265 Arendelle Frozen Castle) and dark red (43289 Belle & the Beast's Enchanted Castle).

Colour (element ID)SetsPiecesExample sets
Dark Bluish Gray46450992242710431031676388
Dark Blue6153589 · 46147911625710401025531126
Blue6340549 · 455864214414047860906098
Black6534130 · 600064491610224109374720
Green6299934 · 4626002912713694113130170
Tan4252630 · 411406234598859785958
Sand Green6444630 · 613656334764152102643241
Sand Blue42949652688238822
Dark Turquoise6458982 · 6282865254116743224
Royal Blue42238372287798799
Red4558641 · 419847822492410166
White6529346 · 3688011243265
Dark Red66076691243289

Where to buy part 3688

Setopedia shows no prices: they vary by colour, condition and seller. Amazon links are affiliate links.

Search part 3688 on AmazonPick a Brick (lego.com)BrickLink entryRebrickable entry

Sets that include part 3688

Sets ranked by popularity that include at least one part 3688, in any colour.

More parts in the Bricks Sloped category

All parts in the Bricks Sloped category

Frequently asked questions

How many LEGO sets include part 3688?

Part 3688 (Brick Sloped 75° 2 x 2 x 2 Quadruple Convex) appears in 85 sets listed on Setopedia, from 1995 to 2026, in any colour.

Which LEGO set contains the most copies of part 3688?

Set 10176 Royal King's Castle, released in 2006, contains 8 copies, the highest count in our database. On average, a set containing part 3688 has 1.9.

Which colours does LEGO part 3688 come in?

13 colours are listed for part 3688. The most common is Dark Bluish Gray, found in 22 sets.

What is the rarest colour of part 3688?

According to our inventories, it is white, found in only 1 set (43265 Arendelle Frozen Castle).

What is the element ID of part 3688 in dark bluish gray?

In dark bluish gray, part 3688 has element ID 4645099. Number 3688 is the mould number, the same for every colour.

Is LEGO part 3688 still used in recent sets?

Yes: it appears in sets released in 2026, such as 43302 Main Street, U.S.A..

Where can I buy LEGO part 3688 individually?

Single parts 3688 can be ordered on Pick a Brick (lego.com) in colours currently produced, or on BrickLink for older colours. The part is also included in the sets listed on this page.