I will probably get flak for that, but I think it needs to be there,  its probably the best TPS ever made.

Half-Life

Age of Empires II

Grim Fandango

Diablo II

Warcraft II

Starcraft.

Command & Conquer: Red Alert

Command & Conquer: Tiberian Sun

Any true gamer should not be without these.

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fixed

Super Mario Bros 3

Mario 64

Tetris

Golden Eye 64

Resident Evil

Metal Gear Solid

Super Mario Kart

Age of Empire

A link to the past

Chrono Cross

Edit

1-10: TALES OF SYMPHONIA!

Done... how's that?

   I consider someone who plays any kind of game seriously a gamer but since you used the phrase 'to be considered a gamer',

1. A Zelda Game

2. A GTA Game

3. A JRPG (not everyone likes turn based, but not all RPGs are turn based)

4. An adventure focused FPS like Metroid, Half Life or Bioshock

5. A multiplayer focused FPS like COD

6. A 2D platforming game, preferabbly Mario or one of the better Sonics

7. A 3D platforming game. This must include Mario

8. A fighter (2d or 3d doesn't matter)

9. A Metal Gear game. Every 'gamer' must beat at least one of these

10. Something Tetris or Pac Manish. Something high score oriented.

  If one has played at least one game in each of these categories, I can forgive him for having never played a good sports game, racing simulator, or anything else he has missed out on.

Tetris

Mario Bros.

Doom

Metroid

Sonic

Halo

Grand Theft Auto III

Soul Calibur

Rock Band

Zelda

Funny how opinions and facts can be so different. This topic is probably subject to opinion only but can not actually have any facts. I've listed my own games and then I see someone else's list, which he listed with his honest opinion, and I haven't played a single game in the list! Yet I consider myself a true gamer. I've beaten Age of Empires II on mobile though, LOL!