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→Game Options
''Note'': The '''ALPHA LOCK''' must be in the OFF position (up) when joysticks are used.
====How to Select Game Options====
When the instruction screen appears with the statement PRESS ANY KEY TO PLAY, you may change the preset game options by pressing '''AID'''. A screen which lists each of the options by number appears.
[[File:Alien Addition Options Screen.png|400px|center|thumb|Alien Addition Game Control Options screen]]
Follow the steps below to select the game options you want.
# Press the number of the Game Control Option you wish to change. The cursor then moves to t.he line for that Game Control Option and flashes alternately with the previously selected number or letter.
# Type the number or letter of the variation you want for that option.
# Change as many options as you want.
# When you have completed your selections, press '''5''' to EXIT GAME CONTROL and to return to the instruction screen. Press any key to begin the game, which is now programmed according to your chosen options.
''Note'': Pressing '''QUIT''' resets the computer to the preset options for the game. For example, if you want to use joysticks, you must select the joystick option when you first begin to play.
====Contolling the Laser Cannon with the Keyboard====
Pressing the '''S''' (←) or '''G''' key moves the cannon to the left. To move the cannon to the right, press the '''D''' (→) or '''J''' key. Fire the cannon by pressing the '''Q''' or '''Y''' key or the '''SPACE BAR'''.
To change an answer displayed on the laser cannon, press the appropriate number key on the keyboard. The answer on the laser cannon may also be changed by pressing the '''E''' (↑) or '''H''' key to increase the number or by pressing the '''X''' (↓) or '''N''' key to decrease the number.
====Controlling the Laser Cannon with Joysticks====
When the joysticks (Wired Remote Controllers) are used to play Alien Addition, there is one important difference in how the game is played. With the joystick option, the answer appearing on the laser cannon is controlled by the computer and cannot be changed from the keyboard.
First, determine which problem is correctly answered by the number appearing on the laser cannon. Then position the laser cannon under the alien ship bearing that problem by moving the joystick lever to the left or right. When the laser cannon is in position, fire the laser by pressing the '''FIRE''' button on the joystick.
Sometimes the answer appearing on the laser cannon is correct for more than one alien ship's problem. When this occurs, firing the laser at the lowest alien ship with the correct problem is the best strategy. Otherwise, the correct answer for the lowest alien ship may not appear again before that ship destroys the laser cannon.
''Note'': The '''ALPHA LOCK''' must be in the OFF position (up) when joysticks are used.
