assemble all of the pieces to reveal Mermaids visiting their sea creature friends in their tropical and polar environments. Ravensburger’s 2 x 24 piece puzzles have sturdy pieces that are easy to hold and manipulate so your little ones will be puzzling on their own in no time! The backside of each puzzle is printed with unique patterns so you can identify which pieces belong to each puzzle. For ages 4 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.