Paradox Interactive has announced sales of city-building sim Cities: Skylines have passed 500,000.

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The announcement was made on Twitter , and comes four days after it was revealed the title had sold 250,000 units in its first day on sale.An antidote to the disappointment caused by 2013's SimCity, our review of Cities: Skylines (which, it should be noted, isn't part of the Cities series of games like Cities XXL made by Focus Home Interactive) gave the title an 8.5 after finding its huge, bustling cities to be incredible fun. Cities: Skylines is about the simple joy of building," wrote IGN's Dan Stapleton. "It’s a really impressive and often beautiful simulation, where an amazing number of virtual people go about their business across a huge swath of land. Getting in and creating something is easy, though mastering it will require extensive research on community wikis to understand why growth is stunted even when you address your citizens’ apparent concerns."

Luke Karmali is IGN's UK News Editor. You too can revel in mediocrity by following him on Twitter