The requirements for Majora's Mask 5 Masks is:
- The game starts from a race file that can be gotten by doing nothing other than depositing 101 rupees in the bank in the first cycle then getting the Deku Mask then exiting Clock Tower then playing the Song of Time then resetting.
- Timing starts when you select "Yes" for that race file
- Timing ends when you have any 10 masks which means you just need to get 9 of them because you already have the Deku Mask.[1]