A low approach rate makes reading the main challenge: stacks, odd spacing and awkward aim. 4,658 maps from 1,295 tournaments. Median 5.45★ (middle 80%: 4.5–6.4★), 2:36 long, 175 BPM. 47% of maps are AR 8 or lower, against at most 12% in the other Hidden slots.
Collected from 1,591 osu!standard tournament mappools listed on osu!collector. A map's slot is its position within its mod bracket in the pool (the third NoMod map is NM3). The skill in the title is what this slot traditionally tests, but every tournament pools differently, so many maps won't match the label.