My Hannah likes to play Find the Kong. We make her sit and stay in the bedroom while we hide the kong in the family room. When we say okay, she comes to look for it. Of course it is always at a level where she can get to it but not necessarily in plain sight. She just keeps looking until she finds it. It's a stitch to watch. Sometimes we use "warm, warm" when she's getting close, but I don't think she pays much attention to that, I think mostly she uses her sense of smell to locate it.