In the Practice Mode a new card will appear whenever the "New Card" deck is clicked. The answer may be entered using the keypad on the screen, or the keyboard. By clicking on the card, or pressing "=" or "return", the answer will be checked.

In the Game Mode a new game is started by pressing the "New Game" deck. A stopwatch will appear in the upper right corner and you will be timed. A performance thermometer will also appear to indicate how well you are doing. The stopwatch can be paused by simply clicking on it. In the game mode a new card will automatically be selected after either a correct answer, or the second attempt at an answer. A time limit of one, two, or three minutes may be selected.

If the screen gets messed up or mysteriously blanks out, just click in the lower right hand side (or anywhere in the "green") and all objects will be repainted.