There are 12 maps of varying sizes in Phasmophobia, but players may notice the Daily Tasks often challenge them to play on a Medium Map. The size of the map in Phasmophobia often elevates the difficulty of an investigation, as larger maps make it more challenging to find the ghost and easier to lose sanity, which in turn can cause the ghost to initiate hunts more frequently. The size of a map in Phasmophobia is usually determined by the number of rooms, with the smallest being 6 Tanglewood Drive, which has only 10, and the largest, Sunny Meadows, which has 69.

https://screenrant.com/phasmophobia-medium-maps-explained-strategies/