From the manual (TM-181; 1st printing): Table 1-1 Game Option Settings (Settings of 8-Toggle Switch on Space Duel game PCB at D4) 8 7 6 5 4 3 2 1 Option On Off 3 ships per game Off Off 4 ships per game $ On On 5 ships per game Off On 6 ships per game On Off *Easy game difficulty Off Off Normal game difficulty $ On On Medium game difficulty Off On Hard game difficulty Off Off English $ On Off German On On Spanish Off On French Bonus life granted every: Off On 8,000 points Off Off 10,000 points On Off 15,000 points On On No bonus life $Manufacturer's suggested settings *Easy-In the beginning of the first wave, 3 targets appear on the screen. Targets increase by one in each new wave. Normal-Space station action is the same as 'Easy'. Fighter action has 4 targets in the beginning of the first wave. Targets increase by 2 in each new wave. Targets move faster and more targets enter. Medium and Hard-In the beginning of the first wave, 4 targets appear on the screen. Targets increase by 2 in each new wave. As difficulty increases, targets move faster, and more targets enter. Table 1-2 Game Price Options (Settings of 8-Toggle Switch on Space Duel game PCB at B4) 8 7 6 5 4 3 2 1 Option Off On Free play Off Off *1 coin for 1 game (or 1 player) $ On On 1 coin for 2 game (or 2 players) On Off 2 coins for 1 game (or 1 player) Off Off Right coin mech x 1 $ On Off Right coin mech x 4 Off On Right coin mech x 5 On On Right coin mech x 6 Off Left coin mech x 1 $ On Left coin mech x 2 Off Off Off No bonus coins $ Off On Off For every 4 coins, game logic adds 1 more coin On On Off For every 4 coins, game logic adds 2 more coin Off On On For every 5 coins, game logic adds 1 more coin On Off On**For every 3 coins, game logic adds 1 more coin $Manufacturer's suggested settings *To charge by game: Toggle switch 4 at PCB location P10/11 to "on." To charge by player: Toggle switch 4 at PCB location P10/11 ot "off." **In operator Information Display, this option displays same as no bonus.