Equip the Mystery Chip and complete Gear Fortress 3 to get bonus Screws. Completing the stage under a certain time limit provides double the amount of Screws!
Newcomer: Over 9:45—700/Under 9:45—1,400
Casual: Over 6:30—700/Under 6:30—1,400
Normal: Over 6:30—350/Under 6:30—700
Superhero: Over 6:30—350/Under 6:30—700