How to Make Monster Goo

Get down and dirty with some Monster Goo! Yet another creation made from CORNSTARCH! I know you are thinking, “Another cornstarch project?” Cornstarch is seriously becoming a favorite of mine. It can turn into so many things! This is super simple to make and loads of fun. My kids played with it for a good 40 minutes. That is a lot for us!

How to Make Monster Goo

Here is what you need to make your Monster Goo:

  • Water
  • Cornstarch
  • Bowl
  • Mixing spoon or fork
  • A large cookie sheet or a clean flat surface to play on.
  • Food coloring (optional)



The recipe calls for 1/3 cup of water in a bowl  (if you want color, add it before you add the cornstarch – just a couple drops) and add 1/2 cup of cornstarch. Stir together.

The faster you stir the harder it will get to mix it up. Be patient and just dig in it good. It should mix up quickly and will look like liquid in the bowl when it is mixed all the way.

TIP: I don’t know if it an elevation thing or what, but this recipe was way too runny. I added almost another 1/4 cup of cornstarch. You want the texture to be firm when you pick it up and liquid like when it is not moving. That sounds confusing, but you will know what I am talking about when you have it right!

Now the Fun Begins…


Here are some ideas of things that you can do with it:

  • Roll it into a ball in your hand and then see what happens when you stop.
  • Create a monster. Roll it up again and then lay it on the table (or pan) and add 2 marbles for eye balls to create a monster. Watch him turn into “Monster Goo”
  • Talk about the texture of what they feel. Is it hard? soft? sticky? slimy? Are your hands soft or rough?, etc…you get the idea!
  • Give them a couple of bowls/cups and/or spoons and let them transfer the Goo from one to another.
  • For older kids, see if they can recreate the Goo consistency on their own. It really is fascinating for all ages!
TIP: If the Goo gets too dry and is not turning into liquid as fast as before, just add a little water and the fun will continue.


Cleaning Up Tips

  • Do not put the mixture down the sink when you are finished. Leave it out until it dries a little and then put as much as you can in the trash. I have heard that some of these cornstarch mixtures can clog drains.
  • When trying to clean off your playing surface, use the mixing spoon or your hand to gather all the dried pieces on the table and throw them away (see picture above). Then wipe it down with a dry rag. Since it turns into powder it makes it a lot easier to clean up. Then you can use a damp cloth if you have anything left. When I did this before, I wiped down the table with a wet rag and I was forever seeing powder streaks.
  • The same thing goes with any of the mixture that gets on clothing. Let it dry and then shake it off. It will be much easier to get off if it is not wet!
More kid’s activities:

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  1. I can't wait to do this with my kids for Sunday Family Day! Thanks! Happy SITS Saturday Sharefest.

  2. Hey there.
    This is also called Ooblek (sp?). There is a fun book that goes with it! Check it out at the library. Super cute!

  3. Hey, just wanted to let you know, the recipe that works best is one part water to two parts cornstarch. (ie – one cup of water and two cups of cornstarch=lots of fun and not too runny:))

  4. Thanks for all the input! Amy I'll have to check out that book, hopefully our library will have it. Sandi, thanks for the tip. The recipe I had was definately too runny and what I ended up with is was probably the 1:2.

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