Show off the fun and interesting ways you use stone, rocks, concrete, or cement in your projects!

The Stone, Concrete, Cement Challenge is closed.

Grand Prize

19 Prizes

Grand Prize

One Grand Prize Winner will receive:
  • $500 Amazon Gift Card

First Prize

Three First Prize Winners will receive:
  • $250 Amazon Gift Card

Second Prize

Five Second Prize Winners will receive:
  • $100 Amazon Gift Card

Runner Up

10 Runner Up Winners will receive:
  • $50 Amazon Gift Card
How It Works

Write an Instructable

Create a new Instructable that fits the guidelines outlined in the contest description above. To be eligible, Instructables must be published between Aug 17, 2020 and Sep 14, 2020 (11:59pm PT).


Upon publishing your Instructable you'll see checkboxes for open contests. Select Stone, Concrete, Cement Challenge. If you have entries currently eligible for entry, it will also show up by clicking "Enter this Contest" on the right side of this page.


Entries are accepted by Instructables staff within one business day Monday - Friday. What matters is the submission time, not acceptance time.


A panel of judges made up of Instructables staff and respected members of the community rate the finalists. The averages of the ratings determine the winners.


When the winners are decided they will be notified and announced here on the contest page.