Spinmaster Aquadoodle Thomas Toot N Doodle The activity toy that provides children with hours of magical doodle fun Use the Aquadoodle Water Pen or water track roller to create doodles on the mat, then watch the train magically follow the water line When the doodle dries, or stops so does the train Use over and over again for hours of 'mess free' fun! That's it, no ink, no paint, no washing!