Pick a tool, then tap the tower. Every room needs something under it. Bare floor is laid for you, and each level of it further down costs more, so building high over open space adds up. On a phone, tap once to preview, drag it to adjust, and tap it again to build.

Rooms above the street need an elevator stop on an unbroken stretch of rooms; nobody walks across bare floor. Crowded shafts make people queue and cost morale, so add cars. From three stars, an express stops at the lobby, every basement floor and every tenth floor (the sky lobbies). Start a sky elevator at a sky lobby and residents change there.

Goals under the top bar pay bonus credits. More residents earn stars, and each star unlocks rooms, taller floors and more elevators. Residents expect more at every star.

From two stars, each floor has a gang meter on the left edge. Empty homes, unhappy residents, dark rooms and unwatched bare floor let gangs in; security, cameras and jobs keep them out. Tap a room on a gang floor to Squeeze, Raid or call the Judges.

Machines are loud, so put them in the basement or soundproof them. An amber dot on a room needs attention and a red one is broken.

Drag to move and pinch to zoom. On a computer, scroll to move, ctrl + scroll or + and - to zoom, and m for the money view. $ shows what rooms earn and 📊 the daily report.