What is the greatest first party title ever published by Nintendo, Sony, Microsoft, Sega, and Valve?

Essentially, this is a very simple question- for all the major platform holders in the last 30 years or so, what is the single greatest game that those platform holders have ever published and (co)developed?

Here are my answers:

• Nintendo: The Legend of Zelda: A Link to the Past
• Sony: The Last of Us
• Microsoft: Halo 3
• Sega: Phantasy Star 4
• Valve: Portal 2

What about you all?

Those are good picks, i think id go with,

• Valve: Half-life 2
• Sega: Street of Rage 2 (Forgive me Skies for i know not what i do).
• Microsoft: I honestly cant pick, ive never experienced their games enough.
• Sony: Shadow of Colossus
• Nintendo: Super Metroid

• Nintendo: The Legend of Zelda: OoT
• Sony: Uncharted 2
• Microsoft: Fable 2
• Sega: Aliens: Colonial Marines Sonic & Knuckles
• Valve: Portal 2

Ninty - Eternal Darkness.

Sega - Yakuza 4.

Sony - the Last Of Us.

MS - Forza 3.

Nintendo: Perfect Dark
Microsoft: Halo Combat Evolved
Sony: TLOU
Valve: Half Life 2
SEGA: PSO 1

Now that's a list of quality titles.

Nintendo: Super Smash Bros. Melee

Sony: The Last of Us

Microsoft: Halo 2

Sega: Shenmue

Valve: Half-Life 2

Nintendo: Super Mario Galaxy

Microsoft: ?

Sony: ?

Valve: Halflife

SEGA: Sonic The Hedgehog 2

• Nintendo: Mario 64
• Sony: Shadows of the Colossus.
• Microsoft: Halo 1.
• Sega: Gunstar Heroes.
• Valve: Portal 2

Nintendo - A Link to the Past

Sony - Last of Us

MS - Halo CE

Sega - Phantasy Star Online

Valve - Left 4 Dead 2

I'm only answering for Nintendo since I can't be bothered to think about the rest right now: Metroid Prime.

• Sony: GOD OF WAR
• Microsoft: GEARS OF WAR
• Sega: YAKUZA
• Valve: HALF LIFE 2

Nintendo: Super Mario 64

Sony: Uncharted 2

Microsoft: Halo combat evolved

Sega: Shenmue

Valve: cant say as i never played any of their games

• Nintendo: Legend of Zelda: The Ocarina of Time
• Sony: The Last of Us
• Microsoft: Halo 3
• SEGA: Shenmue
• Valve (Steam): Half Life 2
• CD Projekt (GOG): The Witcher 3: Wild Hunt
• Blizzard (Battle.net): Starcraft 2: Wings of Liberty

@FinalFighters: You're doing yourself a disservice by not even trying Portal 2, I promise you that. If it's not your thing, it's not your thing, but it's worth at least seeing if it's your thing.

• Nintendo: The Legend of Zelda: Ocarina of Time
• Sony: Gran Turismo 3: A-Spec
• Microsoft: Halo: Combat Evolved
• Sega: Shenmue II
• Valve: Counter-Strike 1.6

@indzman: Yakuza isn't a first party game, it was made after SEGA moved to third party

The funny thing is i own most of their games (L4D2, Portal 1&2, Half-life 1&2 and TF2 are sitting in my steam library, uninstalled) but i just never got around to playing them.

i will take your advice and give portal 2 a go.

@FinalFighters: Before playing, definitely google a "Portal 1 in five minutes" video.

Only going to pick the ones I'm really knowledgeable about.

Nintendo: Majora's Mask- my favorite game of all time, so this goes without saying.

Sega- Sonic Adventure 2 Battle. Mostly because the Chao Garden was addicting as ****.

Valve- TF2. Just a terrific FPS that has more than stood the test of time.

MS: Halo CE

Sony: GoW2

Nintendo: SMB

Sega: Zillion

Valve: HL2

Sega: Shenmue

Sony: The Last of Us

Nintendo: Super Mario Bros 1 (Might not be the best in the series, but its the most important.)

Microsoft: Halo 2

Valve: Counter Strike

• Nintendo: SSBM
• Sony: Shadow of the Colossus
• Microsoft: Halo CE
• Sega: Sonic the Hedgehog (only one I can remember playing right now)
• Valve: Portal

Nintendo is by far the hardest to pick for. I guess I'd put SMB or Metroid Prime if I was going objective greatest game they've ever had (that I've played), but I've had more fun with SSBM than almost any other game I've ever played so I went with that in the end.

• Nintendo - Bayonetta 2
• Sega - Virtua Fighter 2
• Valve - Left 4 Dead 1
• Sony - Legend of Dragoon
• MS - Lost Odyssey

Nintendo: Legend of Zelda The Wind Waker

Sony: Uncharted 2

Microsoft: Halo Combat Evolved

Valve: Half Life 2

Nintendo: Zelda: ALttP
Sony: Not a fan
Microsoft: Halo: CE
Valve: Half-Life 2
SEGA: No idea. I do like Streets of Rage 2..

MS Halo CE

Sega PSO

Nintendo Zelda WW

Valve Orange Box

Sony GT

• Nintendo: Fire Emblem Path of Radiance. Conquest may have the best gameplay in the English entries, this is the one with the best balance of story and gameplay.
• Sony: Soul Sacrifice Delta. Dark fantasy story mixed with alright gameplay topped off with a fairy tale theme. I still consider this the main reason to buy a Vita.
• Microsoft: Halo: Combat Evolved on PC. This came at a time where Arena FPS were kind of dying out. It was a nice surprise that I didn't expect to be any good when I grabbed it.
• Sega: Shining Force. This was my first SRPG, nostalgia is a hell of a drug.
• Valve: DotA 2. They took a popular mod, put it on one of the biggest gaming platforms, and streamlined it enough to make the experience much nicer. I don't see Valve ever topping this one.

Nintendo: A Link to the Past

Sega: Sonic 3 and Knuckles

Sony: Uncharted 2

Microsoft: Halo: CE

Valve: Half-Life 2

I'm not a fan of VF, but I like your style mushroom.

Nintendo - Super Mario 64 : reinvented the industry.

Sega - Gonna have to go with arcade titles like Afterburner and Hang On

Microsoft - Halo. The game single handedly gave face to the brand.

Sony - Gran Turismo. Brought a new standard to racing games and even boosted the popularity of car culture amongst the youth.

Nintendo: Super Smash Bros for Wii U

Sony: The Last of Us

Microsoft: Gears of War 3

Valve: IDK, probably Half-Life 2 Don't really like any of their games.

Nintendo: Smash Brothers

Sega: Sonic the hedgehog

Microsoft: Two way tie between Halo and Forza

Sony: Three way tie between TLoU, Gran Turismo 3 and Uncharted 2

So third party publishing like Vanquish doesn't count right? In that case:

Shadow of the Colossus

Halo 3

Super Mario Galaxy 2

Portal 2

Since I apparently can't pick Binary Domain either, Sonic Adventure 2

Nintendo: Metroid Prime

Sony: The Last of Us or Shadow of the Colossus

Microsoft: Halo 2

Sega: Sonic the Hedgehog

Valve: Half Life 2

I'm going to interpret "greatest" as highest quality game as opposed to critical or retail successes.

Sony: The Last of Us

Microsoft: Halo: CE

Nintendo: Super Mario World (2nd: OoT)

Valve: Half Life 2 (51/49 split between CSS IMO)

Sega: idk, gonna have to ponder it over

Sony R&C ACIT

MS Halo CE

Nintendo Super Mario Galaxy 2

Sega Sonic the hedgehog

Valve Portal 2

Nintendo: Mario 64

MS: Gears of War

Sony: God of War

Sega: Sonic Adventure 1

Valve: Half Life

Sony: The Last of Us

Nintendo: Final Fantasy III (SNES)

Sega: NFL2k1

Microsoft: Shadow Complex

Valve: Half-Life 2

NINTENDO: Donkey Kong Country Returns

SONY: Bloodborne

Don't have much experience with the others.

Edit: oh this is for 1st party titles? That really narrows down Sony's options for me.... Does a Crack on Time count even though insomniac wasn't 1st party for them?

• SEGA: Streets of Rage 2
• Valve: Counter Strike
• Microsoft: Halo CE
• Sony: Omega Boost
• Nintendo: Pokemon R/B/Y

@Pikminmaniac: Bloodborne counts, don't worry

sony: TLOU

MS : Gears

sega: sonic

nintendo: super mario bros

valve : cs:go

Deus Ex 1

Nintendo: Super Metroid
Sega: Shining Force
Microsoft: Halo 2
Sony: Demon's Souls
Valve: Counterstrike

A Link To The Past

Shadow Of The Colossus

Gears Of War 2

Shining Force

Portal

Nintendo: Majora's Mask
Sony: Demon's Souls
Microsoft: Age of Empires 2
Sega: Sonic 2
Valve: Half Life 1

Nintendo: Super Mario RPG: Legend of the Seven Stars

Sony: Ratchet and Clank/Kingdom Hearts

Microsoft: Gears of War

Valve: Left 4 Dead 2

Many people above posted GeoW for Xbox, even though at the time that was developed by EPIC and an EPIC owned IP back then, and the title does say greatest 1st party title published, so yeah if GeoW counts, so would Ratchet games.

• Microsoft: Halo: Combat Evolved
• Nintendo: Super Mario Sunshine
• Sony: Uncharted 2
• Sega: Sonic The Hedgehog
• Valve: Half-Life 2

• Nintendo: The Legend of Zelda: Wind Waker
• Sony: Ratchet & Clank: Up Your Arsenal
• Microsoft: Fable or Halo (the first games)
• Sega: Sonic Adventure 2
• Valve: Left 4 Dead