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Crack the Code is one of my favorite cooperative activities. While there are several versions of this activity, I found the one created by Ryan Ellis particularly interesting. I discovered it while listening to his podcast. I then headed to his website to see the activity sheets he created.
Inspired by this activity, I created a Google Slides doc to use in class. Click on the pic below to view a copy. Download or make a copy for yourself!
The last two slides are the Teacher instructions. Enjoy!
Thanks for the share Cliff! I've actually done a similar activity called "mine field" but I LOVE all of the layers to this one and the implementation of easier and harder. Great share!