You can lose a life by taking a single shot from an enemy or by falling off from the edge of the complex. The game will end when you lose a life with no lives remaining. If you scored enough points to enter the High Score List, a Name Entry Window will appear immediately after the game ends. Press up or down to cycle through the characters and press right to move the cursor over to the next character. If you have a credit remaining to continue the game, a countdown will appear, so press before it reaches zero to carry on the game from where your agent perished.