https://store.steampowered.com/

1. The Division (80% off)
2. Undertale (50% off)
3. Dishonored Definitive Edition (50% off)
4. Just Cause 3 (85% off)
5. Left4Dead 2 (90% off)
6. Borderlands 2 (75% off)
7. Portal 2 (90% off)
8. Saints Row IV (75% off)
9. Fallout New Vegas (67% off)
10. Rust (75% off)
11. Civilization 5 (75% off)
12. Rocket League (50% off)
13. Killing Floor 2 (60% off)
14. Resident Evil 7 (35% off)
15. Grand Theft Auto V (67% off)
16. ARK: Survival Evolved (67% off)
17. Dying Light (60% off)
18. PlayerUnknown's Battlegrounds (33% off)
19. Fallout 4 (50% off)
20. Dark Souls II Scholar of the First Sin (75% off)

I think that everyone will find something for themselves