Named for their creator, psychologist D.B. Elkonin, Elkonin boxes are a teaching tool that helps strugging readers learn to break words down into their component sounds. This free online Elkonin box tool, allows the student to drag a colored circle into a box while listening for each sound or phoneme. Students and teachers can customize the activity by changing the color of the circles or increasing the number of boxes to be used, as their literacy skills increase. Help students develop literacy skills in decoding and spelling with this simple online educational activity.