If you’ve been waiting around for an excuse to do something nice, here’s your chance.

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On Tuesday, the new Unity Matters program, a partnership of Be the Change For Your Community and Bluff City Theater’s YETI and YMP programs, will launch what they’re calling the “Unity Rocks” challenge.

Kids taking part in the Unity Matters program have painted 35 rocks with a distinctive pattern, and will be hiding these rocks Tuesday around Hannibal.

Your part in the challenge goes like this: If you find one of these rocks, you will find a simple challenge on the bottom of the rock, post a picture of yourself and the rock, along with the challenge and what you did, then re-hide the rock for someone else to find.

You can post your pictures to Unity Matters on Facebook, #Hannibal_Unity Matters on Instagram and UnitymattersHB on Twitter.