Nintendo 64: Goldeneye
Xbox: Halo: Combat Evolved
Xbox 360: Halo 3
Nintendo Wii: Donkey Kong Country Returns
Game Boy Colour: Pokemon Blue
Game Boy Advance: Pokemon Sapphire
Nintendo DS: Pokemon Pearl
In most cases, I've owned better games that were less addictive, so in terms of enjoyment I would go for Halo 3 over Halo Reach and Pearl over White/SoulSilver etc.