Oh No! I've mixed the hard-boiled eggs with the fresh ones.

1. Step1

   Gently place the egg on its side on a countertop.

2. Step2

   Spin the egg.

3. Step3

   If the egg spins freely, it's hard-boiled.

4. Step4

   If it wobbles and stops spinning, it's not hard-boiled.

How to Tell if an Egg Is Hard-Boiled | eHow.com