The LEGO 2x4 brick is somewhat of an icon of LEGO, and the majority of official LEGO bricks can connect back to it. However, the number of bridging bricks required can vary, depending on the piece. Some pieces, like a 1x1 Round Tile, can be connected directly to it; however, others, like the Technic Axle 32, require additional pieces (in this case, the Technic Brick 1 x 2 with Axle Hole) to bridge the gap.

The piece I can think of that requires the most of said bridging pieces to connect back to a 2x4 is the body of the Bohrok Canister assembly, which requires 4 pieces to reach the 2x4: the lid, the hanger clip, a Bohrok ribcage, and a 1x2 Brick With Pin. My challenge is, can you do me one better? What piece takes the most bridging pieces to connect back to a standard 2x4, and what is the chain required for it?


  • The piece must be official LEGO; no messing around with off-brand pieces with absurd new connection types.
  • All connections used must be legal; no strapping things together with rubber bands and calling it good (that would take all the fun out of it).
  • There must actually be a method of connecting the pieces together; pieces like the ball used in Scorpion Palace or any of the BIONICLE canisters without built-in studs are just cheating.
  • This might actually be a good puzzle for Puzzling.SE, but you already posted it here, so. Commented Aug 17, 2016 at 23:40
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    I feel like puzzling is more about wordplay or math tricks than physical stuff.
    – user6907
    Commented Aug 17, 2016 at 23:45
  • 1
    This is a nice break from the usual "what is this obscure part" -- no problem with this IMHO. Commented Sep 16, 2016 at 0:05
  • I suggest that you post your best solution as a separate answer (possibly with pictures), so it can be separately commented and voted upon.
    – Wrzlprmft
    Commented Nov 12, 2016 at 11:29
  • @Wrzlprmft Sadly, I no longer have any of the original Bohrok canisters. However, physical construction of the winning chain isn't necessarily a requirement; this is more a parts knowledge test than a supply one. Commented Nov 21, 2016 at 3:15

5 Answers 5


This answer is based upon the wrong assumption that Technic chain links and conveyor-belt links (a.k.a. bulldozer chain links) connect to nothing except each other. As remarked by Ivan Sanchez, this is contradicted by this set, which uses a connection between a conveyor-belt link and a standard arm/rod.

Assuming that these chain links only connect to each other, the only way to connect them to something else, is wrapping eight of them around a standard 16-cog gear. (You can also wrap six of them around an 8-cog gear, but I would not consider that a robust and intended connection.)

Finally, the gear can be connected to a length-3 axle with stud, which in turn can be connected to the bottom of the 2×4 brick.

For bulldozer chain links, this looks like this:



Now, it depends on how you interpret the challenge: You need nine other pieces to connect the chain link to the 2×4 brick. However, many of those pieces are again chain links and there are only two pieces between every chain link and the 2×4 brick.

  • I'm terribly tempted to give it to you... I'm just trying to figure out whether connecting those links to standard rods is legal. If it is, a 1x4 antenna drops the chain down to one link. Commented Nov 13, 2016 at 3:52
  • I think you can also actually clip them to one of the various thin antenna pieces like 2569, although I would assume that's not a "legal" connection. Commented Jan 1, 2020 at 22:09
  • Couldn't you use a 88072 Plate, Modified 1 x 2 with Arm Up to connect the thread to the brick? I think 40175-1 Policeman with Cookie and Stinger polybag is using that technique. Commented Jan 6, 2020 at 0:59
  • @IvanSanchez: That’s what Lepidolite Mica suggested in the first comment, leaving the question whether it was a legal connection, which the set you reference answers. See my edit. (At least that set is younger than my answer.)
    – Wrzlprmft
    Commented Jan 6, 2020 at 9:34

Thornax, 7 connections.

This is just a start, but here's a 2x4 connection to a BIONICLE thornax.

enter image description here

BIONICLE Ball, 6 connections

The extra two pieces are needed to hold the ball in place, making it truly connected.

enter image description here

  • Ooh. Sorry, but this brick and a 4 axle can bring the Thornax down to a 4-piece chain, and it can be used with the Zamor sphere as well. You're on the right track, though! Commented Aug 18, 2016 at 2:53
  • You could also get it down to 3 pieces by putting a stud in the Thornax launcher's pin hole (maybe not technically legal anymore, but I know LEGO has done it before). Commented Jan 1, 2020 at 22:07

I have another case for 4 connections. 18592 - Propeller 3 Blade 13 Diameter (Ninjago Airjitzu Flyer Vortex Rotor), can be attached to 2 x 4 brick with a help of following 3 parts below:

  • 18590 - Technic, Gear 8 Tooth with Pin Holes and Ninjago Flywheel Socket - Short Shaft
  • 18585 - Brick, Modified 2 x 4 with Pin Holes and Flywheel Socket (Ninjago Airjitzu Flyer Handle)
  • 16965 - Human Tool, Rip Cord Flexible with Handle Thick for Ninjago Airjitzu Flyers
  • I could do it with 2 pieces, 6558 Pin 3L and 2444 Plate, Modified 2 x 2 with Pin Hole. Or maybe even 1 15461 piece if putting a stud in the pin hole is allowed. Commented Jan 1, 2020 at 22:16
  • None of these parts provide a connection and I would consider them cheating similar to using gravity to call it "zero piece solution", rubber bands or string with studs on both ends to call it "single piece solution".
    – Alex
    Commented Jan 2, 2020 at 7:20
  • Sorry, I forgot to list the black circular piece that connects to the propeller. Those pieces would connect to that piece and hold the propeller in place. I've done something similar to attach it to an axel before. Commented Jan 2, 2020 at 7:24
  • In any case, my suggestions probably aren't 'legal' so this isn't a bad answer. Commented Jan 2, 2020 at 7:41
  • If I understand correctly, your solution is targeted to be applied on top of 18590 piece, where Trans-Clear cone is used to be attached in a set. I cannot see how such solution could be applied from the bottom of the propeller. Or am i missing something? In such case propeller would only hold if notches within propeller wouldn't align with cuts on 18590 part. Otherwise the propeller would fall off. So a bit of grey area here, as luck is now involved here.
    – Alex
    Commented Jan 2, 2020 at 7:43

Are you counting sub-assemblies as separate pieces?

How about part 983 a Minifigure hand.

That requires 981 Arm, 973 Torso, 970 Hips, and 971 a Leg.

For a minimum total of four interconnections.

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    ...you really don't need any connecting pieces to attach a minifig hand to a brick... Commented Jan 1, 2020 at 21:48
  • Minifigure hand can have any piece with 3.18 mm bar attached. You can then use any part which has both 3.18 mm bar and stud (or anti stud) to get hand attached to 2 x 4 brick. For example, Bar 1L with 1 x 1 Round Plate with Hollow Stud (32828) can be attached in two ways (with stud and anti-stud). This would bring it to just two connections.
    – Alex
    Commented Jan 2, 2020 at 7:27
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    Actually, ignore my suggestion above. Minifigure hand has a stud itself! This means it can be attached directly to 2 x 4 brick's anti-stud on the bottom.
    – Alex
    Commented Jan 2, 2020 at 7:47

Maybe one of the LEGO storage systems (https://www.lego.com/en-us/product/lego-8-stud-black-storage-brick-drawer-5005718) or apparel could be a candidate?

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