Post-apocalypse real-time strategy game They Are Billions leapt one position up the Steam top selling ladder last week.

Numantian Games' project continues to be a hot seller on the platform, likely off the back of press coverage for the title. The game launched into Early Access on December 12th - one aspect that might have helped They Are Billions' sales is the roll out of Spanish language support. This no doubt opened the game up to a large market.

Curve Digital's Human: Fall Flat rises on place to No.3. Last week, the indie publisher confirmed to PCGamesInsider.biz that the game had sold over one million copies. SteamSpy data now pegs sales as higher than 1.5m.

Counter-Strike: Global Offensive rises to No.4, likely due to the ELeague tournament that was taking place at the end of last week. This also saw the game featured on the Steam homepage, with profiles for top players, which no doubt kept the shooter front of mind for many people.

Speaking of tactical shooters, Ubisoft's Rainbow Six: Siege has a presence in the Top Ten this week, with sales of the Year Three Season Pass being the seventh most-purchased item of the week, while the base game was the tenth. The content pass was rolled out in the middle of December.

Meanwhile, two Early Access projects enter the Top Ten in eighth and ninth places respectively. Northgard from Shiro Games sales are looking to have been driven by a slight discount over on Humble, while Slay the Spire's ninth place positioning probably due to a large patch which was released on January 12th.

Below is the Steam Top Ten for the week ending January 14th:

1. Playerunknown's Battlegrounds, PUBG Corp
2. They Are Billions, Numantian Games
3. Human: Fall Flat, Curve Digital
4. Counter-Strike: Global Offensive, Valve
5. Divinity: Original Sin 2, Larian Studios
6. Grand Theft Auto V, Rockstar
7. Tom Clancy's Rainbow Six Siege - Year Three Pass, Ubisoft
8. Northgard, Shiro Games
9. Slay the Spire, Mega Crit Games
10. Tom Clancy's Rainbow Six Siege, Ubisoft