LIVE FROM THE SEWERSHome of the Pizza Rat. You fall through a manhole on First Avenue and land at rat scale, where every human thing is colossal and the rats have built a city out of everything New York drops, flushes and forgets. 12 rooms, one trick in each, and the only people down here have an eye flower for a head.

Customs confiscates anything useful. Pizza Rat has a shrine on the First Avenue L stairs, and the stairs get longer every time you push the slice. The goldfish run a relocation agency called Upstate. An alligator pulled out of a sewer on East 123rd Street in February 1935 does two sets a night. There is a cathedral made of grease, a stock market in breakfast crumbs, lost property at the size it was lost at, Alfred Beach's secret 1870 air subway, a spa that runs on Con Ed steam, a rat council that has debated reopening City Hall station since 1945, a bodega cat that runs immigration, and a sewer king who rents his throne by the minute. Census New Yorkers by MLow hang on every wall, from the block above.

SKATE MODE: every room is a skate spot, with three goals in each of the 12 rooms, 36 goals in all. Ride as Pizza Rat, the customs officer, the goldfish broker, the gator, the cantor, the crumb trader, the bodega cat or the sewer king. K or the SKATE button switches any time.

Desktop: WASD to walk, mouse to look, click anything, V for the vertical clip of any room, M for sound, Z for binoculars, N for a line on the floor to the next door, [ and ] for the previous and next room, R for a random room, or pick one from the list. K to skate: W pushes, S brakes, A and D steer, SPACE ollies, 1, 2 and 3 flip, C picks your rider. Phone: left thumb walks, right thumb looks, tap anything, FLOORS for the list.