Equip the Mystery Chip and complete Gear Fortress 2 to get bonus Screws. Completing the stage under a certain time limit provides double the amount of Screws!
Newcomer: Over 8:45—700/Under 8:45—1,400
Casual: Over 5:50—700/Under 5:50—1,400
Normal: Over 5:50—350/Under 5:50—700
superhero: Over 5:50—350/Under 5:50—700