Fisher-Price Roller Blocks Play Wall Two sides of exciting Roller Blocks play Grows with baby from Sit, Crawl & Play to Stand, Cruise & Play Includes 4 Roller Blocksfun on their own to stack or roll! Baby activates fun sounds by sending blocks down the ramps or the peg wall or batting at the teeter-totter Fun sounds, bright colors, friendly faces and exciting action help stimulate babys senses