# Cities: Skylines

> Paradox reported about 250,000 copies sold in the first 24 hours, including preorders.

- Owner: Paradox Interactive (publisher); Colossal Order (developer)
- Kind: Game
- Sector: Gaming
- Seed date: 2015-03-10
- Peak date: 2015-03-10
- Spread Score: 45 (Notable), v1.2
- Mechanics: Pairing, Platform jump

## Summary

Paradox announced Cities: Skylines in August 2014 and sent streamers copies two weeks before its March 10, 2015 Steam release. It peaked at 60,386 concurrent players on launch day, sold 1 million copies in about five weeks and passed 12 million by 2022.

## Timeline

- 2014-08-14 — Paradox Interactive (Press) — Paradox Interactive announced Cities: Skylines at Gamescom.
- 2014-08-18 — PC Gamer (Press) — PC Gamer covered the announcement and framed the trailer as taking aim at the latest SimCity.
- 2014-08-20 — Colossal Order and Paradox Interactive (Reddit) — The developers held a Reddit AMA, promoting big cities, modding and offline play.

The full timeline, metrics and sources are on the case page, or via the Pro API (https://howitspread.com/developers).

Canonical URL: https://howitspread.com/cases/cities-skylines

Cite as: How It Spread (2026). “Cities: Skylines.” Case HIS-00446. Spread Score v1.2: 45/100. Updated 2026-10-13. https://howitspread.com/id/HIS-00446