Scoop up water from the washbasin and pour it in the top stack to start the water maze fun! our clever waterfall set helps kids explore the wonders of water movement…from a cascading waterfall to a spinning waterwheel! kids can use the waterfalls one at a time or stack units 2 3 or 4 levels high...then pour water into the top and watch their multilevel waterfall creation come to life! plus the mix & match design lets kids create a new effect every time! each durable plastic unit measures 5 tall. through playing the waterfall set kids can develop hand-eye coordination motor skills and shape recognition. it was tested and certified to ensure material safety. so you don't need to worry about your baby getting hurt. this game is suitable for boys and girls."