Assemble the pieces to reveal our favorite construction vehicles hard at work on the site. Ravensburger 2 x 12 and 2 x 24 piece Puzzles are a fun way to train recognition, logical thinking, patience, and hand-eye coordination. Puzzle difficulty when chosen correctly, strengthens your child’s self esteem and short term memory while having fun! For ages 4 and up. WARNING: CHOKING HAZARD – Small Parts. Not for children under 3yrs.