6 of the 8 best selling games of all time have the word, "Mario" in their titles.

Got this from a few different websites with top 20 lists. - Not sure how up to date it is. There was some commentary on one about the sims selling more than 10 million including the expansions (but that's to be expected... there have been like 14,200 expansions so far I think.)

1. "Super Mario Bros." for NES: 40 Million Units
2. "Tetris" for Gameboy: 33 Million Units
3. "Super Mario Bros. 3" for NES: 18 Million Units
4. "Super Mario World" for SNES: 17 Million Units
5. "Super Mario Land" for Gameboy: 14 Million Units
6. "Super Mario 64" for N64: 11 Million Units
7. "The Sims" for PC: 10 Million Units
8. "Super Mario Bros. 2" for NES: 10 Million Units
9. "Grand Theft Auto: Vice City" for PS2: 8.5 Million Units
10. "Harry Potter and the Sorcerer's Stone" for PSX: 8 Million Units
11. "GoldenEye" for N64: 8 Million Units
12. "Donkey Kong Country" for SNES: 8 Million Units
13. "Super Mario Kart" for SNES: 8 Million Units
14. "Pokemon Red/Blue" for Gameboy: 8 Million Units
15. "Half-Life" for PC: 8 Million Units
16. "Tomb Raider II" for PSX: 8 Million Units
17. "Final Fantasy VII" for PSX: 7.8 Million Units
18. "Myst" for PC: 7 Million Units
19. "Gran Turismo 3" for PS2: 7 Million Units
20. "Dragon Warrior VII" for PS2: 6 Million Units

What is it they say about silence being golden?