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It starts in a dark alley at night and climbs the city. Step on the rubbish, catch a window ledge, reach the rooftops, cross between skyscrapers, pass the scaffolding and cranes of a construction site, and finally enter a black hole. Holding jump charges five notches; release and you leap with exactly that much force, and nothing changes direction in the air. When you fall, you fall until something catches you — there is no floor under the fall, so a slip at the construction site can drop you to the rooftops, or all the way to the alley. No hand hauls you up: if your feet miss the top, you drop. Old awnings crumble when stepped on, gondolas drift, wet glass slides, and a drainpipe wall can be climbed until your stamina runs out. Everyone climbs the same city on the same day, and closing the tab keeps your place. Nothing rewinds. What lies beyond the black hole is the next chapter.