Valve lists the following nine games as the 10 bestselling titles on Steam for last week. It probably bears repeating that the main reason the Fallout 4 Season Pass appears here is because it's been announced that the price of this will jump by 66% on Tuesday, in case you want to take advantage of the lower price before then:

1. Fallout 4 Season Pass
2. Tom Clancy’s The Division
3. XCOM 2
4. DARK SOULS III Deluxe Edition
5. Counter-Strike: Global Offensive
6. Street Fighter V
7. Grand Theft Auto V
8. Cities: Skylines - Snowfall
9. XCOM 2
10. Firewatch