User summary APF Mathemagician was a large-format calculator with a black and grey plastic case measuring 8.5x5x1.5 in.; it used one 9-volt battery. The device functions as a standard large-character display calculator but can also be switched into "game" mode. Six plastic overlays can be snapped into place to support six separate games (all relatively simple and math based). The included games are: Gooey Gumdrop The Number Machine Walk-the-Plank Football Lunar Lander Countin' On