The game's saucer was originally designed to shoot directly at the player as soon as it appeared on-screen. This was altered so there would be a delay before the saucer took the first shot, giving the player a chance to fire back before the saucer could. This led to the strategy known as "lurking" in which players would leave 1 or 2 asteroids undamaged on-screen while the player continuously picks off saucers for 1,000 points each while still playing on a single credit. Since the saucer could only shoot directly at the player's position on the screen, the player could "hide" at the opposite end of the screen and shoot across the screen boundary, while remaining relatively safe. Many arcade operators complained to Atari about this lurking technique claiming to have lost revenue on the game, so an EPROM was built to reduce these chances.
Submitted By: noidentity
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