The Megasketcher measures roughly 45 cm x 30 cm (18 in x 12 in), with the magnetised 'screen' taking up most of the surface area.
A magic 'pen' (attached by a piece of string to avoid losing it under the sofa) allows children to draw, scribble and write, while the four magnetised stamps add a different dimension to youngsters designs.
Once a composition is complete, or if one too many mistakes has been made, simply pull the eraser lever up and down and, hey presto, it wipes away the redundant drawings.