Introduction: Tetris Ice Cubes

Picture of Tetris Ice Cubes

Make your own tetris block silicone ice cube tray.
The mold created in this project can be used for much more than just ice cubes- try making Jello tetris pieces, or tetris soap, tetris Popsicles, or even tetris ground beef squares!

Mmmmm ... ground beef squares

Step 1: Materials

Picture of Materials

The materials and design for this project are somewhat flexible. The idea is to create many different 1" cubes, and piece them together in the form of the tetris pieces. The tetris pieces are then assembled on a board, creating a positive for liquid silicone to be poured on.

1. 1" thick wood (or any other solid material you have the ability to make the cubes out of; ie acrylic or metal can also be used)
2. Saw
3. Ruler
4. Sander
5. Wood glue
6. Molding Silicone
7. Hot glue gun
8. Exacto knife

Step 2: Making the Blocks

Picture of Making the Blocks

A quick Google image search for "tetris solved" returns the block layout shown below. This design (or any other design where the tetris pieces fit perfectly together) will return the maximum amount of tetris pieces with minimum space wasted. As you can see from this design (5 blocks x 8 blocks) 40 wooden cubes will be needed.

Making the cubes:

1. Cut the 1" thick board into 1" wide strips. Further cut these strips into the 1" cubes necessary. A table saw and chop saw make creating the cubes much easier. I recommend making a few more cubes than necessary to have extra (just in case).

2. To form the "classic" tetris block shape we will sand off the corners of each of the cubes 1/8".

Step 3: Making the Tetris Pieces

Picture of Making the Tetris Pieces

The design that we are using requires two "I" pieces, one "J" piece, one "L" piece, two "O" pieces, one "S" piece, two "T" pieces, and one "Z" piece. If you do not know what I am talking about Wikipedia has a very nice page explaining everything you would ever care to know about tetris.

1. Layout and glue the pieces together using wood glue.

Step 4: Making the Positive

Picture of Making the Positive

The walls of the positive should be made from a nonporous material as to not stick to the silicone once it has dried. I recommend acrylic for this step, but really any nonporous material should work (glass, metal, etc.)

Once the positive housing is made, glue the tetris blocks to the bottom using a hot glue gun.

To prevent the silicone from sticking to the wooden blocks coat each of them in olive oil, or a non-sticking substance specifically designed for your exact type of silicone.

Step 5: Pouring the Silicone

Picture of Pouring the Silicone

Mix the silicone according to the directions provided. Pay careful attention to whether it asks to measure by weight or volume.

Pour the silicone mix over the wooden blocks, filling the housing to the rim.

Let set according to the directions provided (usually it will be at least 10 hours).

Step 6: Removing the Negative

Picture of Removing the Negative

To remove the negative from the holder:

Using a sharp knife, cut around the sides between the housing and the silicone.

If possible break away the sides of the housing (it will make removing the bottom much easier).

Pry the bottom of the housing off of the silicone. Because of the undercuts on the blocks, the tetris pieces will probably remain trapped in the silicone.

To remove the blocks from the silicone:

Using an exacto knife cut away the silicone trapping the blocks in the negative. Once enough silicone is removed flex the mold a bit, and you should be able to peel out the wooden tetris pieces.

Step 7: Making the Ice Cubes

Picture of Making the Ice Cubes

To make clear tetris ice cubes just add water to the mold and freeze.

To make colored tetris cubes, first look up which game color scheme you would like to use from

Next mix food coloring and water to best try and match those colors.

Pour the colored water into the mold and let sit until frozen (5-6 hours).


Pineboy (author)2016-05-11

Nice! This is a really cool idea

TheredpandaT (author)2015-09-18

I want to learn how to make this

Erchan (author)2014-07-21

is it possible to produce fruit flavored ice cubes?

cmedina7 (author)2013-01-10

very nice for a party, =)

HoshizakiIce (author)2012-01-22

Why didn't we think of that.

TheMacyC (author)2011-09-25


builderkidj (author)2011-05-01


SHIFT! (author)2011-03-13

Hey Tetrinate!

Just wanted to say this build is completely amazing and the results I had with my own Tetris Ice cubes were amazing! Thank you also for inspiring me to create my own Video Game ice casts instructable :

You Rule!

vt13013 (author)2007-06-04

Did you tap or vibrate the mold to make sure you didn't have any air bubbles? I noticed a few on the pour images.

Tetranitrate (author)vt130132007-06-04

I tapped it a few times to get rid of as many bubbles as I could.

Mixing the silicone very slowly will also help with air bubbles, check the cure time of your rubber first though, most have more than enough time to be patient when mixing. Ideally you would make a vacuum chamber and vacuum the rubber before pouring it. but be sure not to fill your container more than 2 thirds or less or you'll end up with silicone all over your vac chamber! gooey mess!

it also helps to use an old brush to paint a layer of silicone over the surfaces, especially where there are overhangs, before pouring the rest

robinhood2605 (author)2010-12-29

congrats for your creativity

coppeis (author)2010-12-01

Where could I get the silicone and the positive? Also does it have to be food grade?

P.S. I live in the NYC aria and would prefer not to buy it only line any suggestions?

neffk (author)coppeis2010-12-09

I was reading about silicon the other day and noticed that there are several kinds. They differ in the curing agent, which can be platnium or peroxide. Platnuim is safe for projects in which the silicone cures against skin. Not the same as food grade, but related.

coppeis (author)neffk2010-12-09


Dr. dB (author)2010-07-20

Good Instructable, coherently presented and well photgraphed! I may have to try this, as my wife is an avid (or would that be "rabid"?) Tetris player. I have to keep an NES001 alive and operating on each of our main TVs so she can "satisfy the urge" whenever it strikes... (Plus, the "XBoxed" grandkids are hooked on some of those "quaint, antique" games, too!) Definitely should WASH THE MOLD THOROUGHLY a couple of times, before using, to ensure complete removal of any remaining "release compound". None of them would be very tasty, and some of the "commercial" products are rather toxic... For folks going with wood as their "positive" medium, I would suggest starting with a 1" square moulding strip - might cost a little more but reduces cuts considerably. A hunk of angle iron or a pair of straight 2x4s nailed into a "V" would make a handy "alignment jig" for glueing the shapes. Perhaps a shallow cardboard tray lined with that "release"-type aluminum foil for an expendable mold housing? Hot glue should stick well enough but silicone ought to "peel out" fairly well. Plus, if the hot-gluing is done carefully enough, maybe with some cotton swabs for "dressing-in" the excess around edges, the shapes should "pop" out from behind without much hassle, once the facing foil is removed. (You might even get to keep the undercuts, although the expansion of the water as it freezes might not allow that to work....) This would also make interesting candles, and those needn't be limited to 1" cubes since they wouldn't have to fit a glass...!

mikoto (author)2009-12-30

Oh my goodness, Now I want to play with silicone.

Dr. dB (author)mikoto2010-07-20

hmm... I had that same thought a couple of times while Pam Anderson was "Dancing With The Stars"....

zazukain (author)2009-08-24

Did you not read Step 7? and I doubt that there is something wrong with your caps lock because it just happens to be for the words, "cool" and "aid." Anyway, you could have just fixed it.

Kaiven (author)zazukain2009-10-02

Lol. And why would he apologize for it being stuck if he cuold just backspace and retype it... Some people on the internet just don't have comment sense.

M4industries (author)Kaiven2009-10-17

comment sense
common sense

was that spelling intended?

Kaiven (author)M4industries2009-10-17

I meant Common but Comment actually works xD

pyrorower (author)Kaiven2010-01-03

 Just a typo that happens to fit the context :P

Dr. dB (author)pyrorower2010-07-20

Serendipity rocks!

nodnodwinkwink (author)2010-06-16

Theres plenty of novelty ice cube trays out there for sale online and in shops, this would sell too!

myvoiceisdubbed (author)2010-06-15

Love this. I was going to give it a 4 1/2, but the very idea of tetris ground beef squares... that's an instant 5/5 right there.

Morriscow (author)2010-05-26

 now if only they would disappear when i made rows... hmm *chomp* ow fk my tooth

rennoc (author)2010-02-18

You can make an awesome game from this instructable!!!

anniehela (author)2010-02-18

I like it. Very nice idea and can create more new ideas..

jotism (author)2009-10-20

<b><font face="Sawasdee"><a href=""></a><br /> <br /> there should be some useful stuff there...<br /> </font></b>

mickyminime (author)2008-10-14

i cant find moulding silicone ANYWHERE!!! im so sad. if anyone knows where, please say.

cd41 (author)mickyminime2009-01-02

just a comment but you could use polymorph alittle expensive and not real sure if you can afford/find/want-to-work-with it and might be hard to color unless you got the right grade but if there is absolutly no place for ytou to get molding silicone(to be honest i never heard of it) try it let me know

sharlston (author)cd412009-04-30

what is polymorph?

M4industries (author)sharlston2009-10-17

A prototyping material. Some was used in MAKE: 16 SpyTech.

Dont rely on me. Just google it.

sharlston (author)M4industries2009-10-17


dvsdarrel (author)mickyminime2009-06-25

Have you tried the craft stores in your area? Hobby lobby or Michaels

Hey Jude (author)mickyminime2009-04-05

bentley chemicals or smooth-on often give sample packs out for a small fee. I recon from the pics that this is the actual company too. good luck, if this post isn't too old!

jdc187 (author)2009-09-27

where does one get molding silicone from?

EgViAgN (author)jdc1872009-10-14
adamgillies (author)2009-10-01

Food grade silicone or just normal silicone?

Omegablood (author)2008-03-19

Where do you get the silicone to make the negative mold?

jester_rob (author)Omegablood2008-03-23

You might be able to get it at a name brand craft store like Michael's or someplace. I've seen this stuff at the toy train shop by my house so just look around for craft, miniature, or model shops. You might be able to use something like a silicone caulking that you can find at home depot.

cwebsterlusk (author)jester_rob2009-04-15

caulking is a bit too thick for this. you cant "pour" it right and it creates air bubbles. least thats my experience.

Caulking is also NOT food grade silicone and you should never use it for anything your going to ingest . On smooth on's site, they have a product called smooth sil 940 that they say is food safe. I work in film with smooth on products often. Just because it is silicone doesn't make it food grade silicone, Smooth on has a great help line and they will gladly walk you through what to buy for a project like this!

Omegablood (author)jester_rob2008-03-25

Do you have a name brand for the stuff or the section to find it in? There are several michaels around here.

apburner (author)Omegablood2008-04-23

tap plastic
Try this. I use it for molds for plaster

Omegablood (author)apburner2008-04-23


shooby (author)Omegablood2008-04-03

might be able to just cut an ice cube or two into the right shapes, might be kind of small unit blocks though

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