Sound Puzzles

I bought some "sound puzzles" for Jordan, thinking that he would like hearing the animal sounds when he put the puzzle pieces in the correct spots. He lost all the pieces and we found out that the sounds are activated by any change in light. Now we have a really annoying board that we probably paid ten dollars for so I don't want to throw it away. So instead we hear guinea pig noises every time we turn off the light. But today the puzzle is lost. Somewhere where the lighting continues to change. I'm hoping it has button cell batteries.