Valve has officially released lists and the below link contains the Top Sellers. This is a list of the top 100 games that earned the most gross revenue in 2018, which includes all different kinds of Steam revenue; game sales, in-game transactions, and DLC. Here is the list: https://store.steampowered.com/sale/winter2018bestof/ Steam also has multiple tiers for games with the most simultaneous players. The top tier is games which had over 100,000 players, there are 10 games in this tier but Civ VI didn't make it. Civ VI made the second tier though where a game had over 50,000 simultaneous players. There are 25 games in this category. https://store.steampowered.com/sale/2018_top_played/ A game is placed into a definite tier, but it's place in that tier appears to be randomized. I just refreshed the page and Civilization VI is in 7th place now. (it was 3rd before) I looked at the list before and PUGB was in 9th place which definitely isn't true.