last year only's impossible, but I'll try to list the most recent ones..
1. Civilization IV (and exps.)
2. Team Fortress 2
3. Audiosurf
4. Spore
5. Peggle Deluxe
6. Europa Universalis 3
7. World in Conflict
8. Day of Defeat: Source
9. WH40K Dawn of War
10. Hitman: Blood Money
the words above were backed by NUCLEAR WEAPONS!