Valve explained Steam's Top 10 list last week.
From April 22 to 28, you can look at the full list of top 10 best-selling games on Steam from below:
1-PLAYERUNKNOWN’S BATTLEGROUNDS
2-Frostpunk
3-BATTLETECH
4-NieR:Automata
5-Far Cry 5
6-BATTLETECH
7-Counter-Strike: Global Offensive
8-TheHunter: Call of the Wild
9-Grand Theft Auto V
10-Total War Saga: Thrones of Britannia