Question 1

Where is 3rrrd?

Accepted Answer

3rrrd is in Toshima, Tokyo, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Jujutsu Kaisen 3 The Culling Game does 3rrrd appear in?

Accepted Answer

3rrrd appears in EP10 of Jujutsu Kaisen 3 The Culling Game.

Question 3

Can I visit 3rrrd?

Accepted Answer

Yes. 3rrrd is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Jujutsu Kaisen 3 The Culling Game filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and 3rrrd is one of those real places (EP10).