1. Pokémon Red, Blue and Green
Gameboy - 20.08 Million Copies Sold
2. Super Mario Bros. 3
Nintendo - 18 Million Copies Sold
3. The Sims
PC - 16 Million Copies Sold
4. Nintendogs
Nintendo DS - 14.75 Million Copies Sold
5. Pokémon Gold and Silver
Gameboy - 14.1 Million Copies Sold
6. Super Mario Land
Gameboy - 14 Million Copies Sold
7. Grand Theft Auto: Vice City
Playstation 2 - 13 Million Copies Sold
8. Pokémon Ruby and Sapphire
Game Boy Advance - 13 Million Copies Sold
9. The Sims2
PC - 13 Million Copies Sold
10. Grand Theft Auto: San Andreas
Playstation 2 - 12 Million Copies Sold
According to Gunslot.