To complete the Fortnite Season 10 Ultimate Effort challenges, you will need to collect recordings left by the Visitor in different locations. The latter will be found in Starry Suburbs and Gotham City, respectively on a bed in a house facing a building under construction, and facing the Monarch, Gotham's cinema.
For this challenge, therefore, you will have to go to Starry Suburbs, go to the top floor of the largest red brick house, to find the recording there neatly placed on a bed. In Gotham City, you will have to go in front of the "Monarch" cinema to find the recording in the middle of the street.
As a reminder, it's easier to complete this challenge in Team Rumble, since with the respawn, you won't have to worry about dying.
Remember that Fortnite Season X (10) lasts until Monday, October 14, when the next season should arrive. If you want to reach tier 100 of the Battle Pass and thus unlock all the unique rewards of this season, you will therefore need to complete a large part of the weekly challenges offered, and we are helping you to achieve them.