I know I'm going to get judged for this.
Judge away.

I have never played anything from the following series:
Hotline Miami
Half Life (Kind of, I played like 20 minutes of it)
Grand Theft Auto
Saint's Row
Just Cause
Edit 1: Assassin's Creed
Edit 2: The Witcher
Edit 3: Max Payne
Edit 4: Far Cry
Edit 5: Mass Effect
Deus Ex

If we're speaking games I started but never finished then my most procrastinated on would be Real Myst. My first game on my account was a gift copy of Borderlands but the first game I ever bought on steam was Real Myst (Dec 1, 2010). Started but never finished.

If it's a game that I've never touched at all it would have to be Portal 2. Purchased Nov 23, 2011. Haven't touched it because I started Portal but never finished it (Steam says I haven't played Portal but I did... on steam. Not sure why it doesn't have my time logged).

Gray Matter, Of Orcs and Men, Bloodrayne, Still Life.....

I've had these games installed since I bought them, and have every intention of playing them...but then something always pops up.

I have yet to play Skyrim. It's just there, installed, but I keep putting it off in favour of more casual/short games.

The Witcher 1&2

99% of them

Never played at all, never beat, or simply never made a serious attempt to play?

I'll take "most procrastinated" as "game which I own for the longest time and which I haven't played / played only a little of but still have some interest in playing".

I just recently started The Dig for the umpteenth time (well, probably fourth or so) and immediately had another game trump it. I bought it in 1997 (LucasArts Archive Vol 3). But this post made me realise that it's about time I finished it. So I'll put The Last Express aside (it doesn't look that fun so far anyway) and get back to The Dig. If I remember this resolution at all the next time I want to play.

I have some adventure games older than The Dig that I still want to play, but except for Full Throttle (which was in the same pack, so ties for the title of "most procrastinated") I think I bought them later. I also somewhat want to play Baldur's Gate, which I bought at release and played very little, but that's a lot farther down my list (and is a newer title anyway).

There are games I own for longer and haven't played yet, but I don't remember any of them that I have a real desire to play. The Dig is unique in that I dig it up occasionally and think of playing it, but somehow never get far into it.

Taking into account only Steam, then Sam and Max Season One + Two Pack, which I purchased in May 2008, is the first game which I'm still interested in playing. I finished 4 episodes of the first season (including the season finale), but none of Season 2, so Sam and Max Season Two is the winner of "most procrastinated Steam game".

I'm mostly worried about the series of which I own 3 or more games and haven't played any:
Deus Ex
Hitman
F.E.A.R.
iBomber
Overlord
PixelJunk
RACE 07
RIP
Runaway
Star Wars
Supreme Commander
Tex Murphy
X-COM

I started using Steam in early 2009, after I got a copy of Portal for Christmas. I liked that game.

But one of the first titles I bought on the Steam store was Universe at War: Earth Assault. I still have yet to even install it.

I have many, many games in a similar scenario, but that is the oldest purchase I haven't touched.

I didn't buy anything Half-Life related until Fall 2014 when I got the Valve Complete Pack on sale.

Other than briefly playing a leaked Dreamcast version of Half-Life, I have never played a Half-Life game.

Everytime I play through a game, I decide to play through something else, I want to play The Witcher 1 currently but everytime my computer goes to the desktop for whatever reason, the game freezes.. I want to fix it :(

I have a habit of burning myself out on long games, especially RPGs. They'll be played until I'm a fair way through, then they will never see the light of day again, almost regardless of how much I want to finish them. These games come to mind:

• Final Fantasy XIII
• Kingdoms of Amalur: Reckoning (DLCs)
• Fallout: New Vegas (DLCs)
• RAGE
• GRID 2

There are more; these are just the most recent.

Lots of em, well you know
latest one is GTA V, Wolfenstein and Witcher 3 :D

One of the first games I got on Steam was Killing Floor. I got this as well as Payday-the Heist and Payday 2 and Dead Island Riptide all for a 4-people-LAN-Party as coop games to play. I heard so many good things of Killing Floor and I was actually the one who got the others to buy this game but we didn't get around to play it. I at least started it once and tried to play it for a while but well...
Another game I was really keen on is Bioshock Infinite so I got it at the top tier when it was in a HumbleBundle. I told myself to play the first two games before Infinite, but never finished the first one so didn't even start Infinite...

I stopped at one point to add more games to my account (didn't stop me from buying though XD) unless I want the game really hard (or won it here)

The Witcher 2. I want to play it, but everytime I say to myself "Ok, let's play it" I' not in the mood. Will I ever play it? Who knows

A lot but i've come to the realization that those "worthy my time" will be played someday-soon otherwise their simply not.

Anachronox.. I remember looking forward to the release for years.. then it finally was released 14 years ago and I still haven´t played it, but always wanted to xD I now own it on GOG and Steam and I´m still promising myself that I´m gonna start playing it any day now.. and I´m still convinced I´m gonna love it.

IN Alphabetic Order.

100% Orange Juice
99 Spirits
Agarest ( all of them )
Akane the Kunoichi
Alice Madness Returns
Akane the Kunoichi
Analohue A Hate Story
AR-K
BANZAI PECAN
Bastion
BloodRayne Betrayal
Chantelise
Deponia
Chery Tree High
Crystal Story II
Dislusion Manga Horror
Dreamscape
Dungeon Defenders
Dust An Elysian Tail
eXceed 1,2,3
Fairy Bloom Fresia
Final Dusk
Flower Shop (Summer and Winter)
Fortune Summoners
Freedom Planet
FTL
Go!Go!Nippon
Heileen 1,2,3,
Hyperdimension Neptunia
If My Heart Had Wings
Kami
Labyrinthine Dreams
Last Inua
Life is Strange
Little Inferno
Lume
Luna Shattered Hearts
Magical Battle Festa
Magical Diary
Mirror's Edge
Mitsurugi Kamui Hikae
Nights Into Dreams
One Way Heroics
Party of Sin
Paranautical Activity
Pixel Puzzle ( all of them )
Princess Evangile
QP Shooting Dangerous
Quest Run
Quest for Dungeon
Recettear
Rime Berta
Roommates
Sakura Spirit and Sakura Angels :)
Samudai
Shan Gui
Skyborn
Spoiler Alert
Thomas was alone
Transistor
Unhack
Valkyria Chronicles
Venetica
Wanderlust Rebirth
War of the human tanks
Winged Sakura Mindys arc
Wings of Vi
World end Economica
X-Blades
X-Note
The Yawgh
Year Walk

Holy... fucking...shit.

Thats alot of games :c

All of my games are installed and I have no time to play...

• The Witcher 1 and 2
• Alien Isolation
• Bioshock serie
• Dark Souls
• Dead Island
• Dragon Ages: Origins
• Endless legend
• Fallout 3 and New Vegas
• FTL: faster than light
• Goat simulator
• Half-life serie
• Hotline Miami
• Van Helsing
• Just Cause 1 and 2
• Pillars of eternity
• Saints Row 3 and 4
• South Park
• Terraria
• Valkyria Chronicles
• Wasteland 2

Bioshock triple pack, I also have 2 achievements left for Tropico 4 but I'm not feeling like 100%ing that game yet :v

Fez.

Bought it after many friends told me how amazing it was. It still sits untouched, but installed onto 3 PC builds/upgrades so far.

• Rise of Prussia The game looks great, but it also has quite a learning curve. I need to find the time & energy to force myself past that learning curve.
  -Sub Command Same as above, game looks great, I just need to find the time & energy to force myself past the learning curve.
  -Space Empires V DITO
  -S.T.A.L.K.E.R. series I need to find out which mods to use, and from what I've gathered, the games are not exactly "friendly" to new players. So time & effort again...
  -Dangerous Waters And yet another game with a massive learning curve. I should really not buy as many of these.

• Amnesia series - Not a fan of horror games, but heard lots of hype about these ones
• Skyrim - Too. Many. Bloody. Quests!
• Borderlands - I'll get to it eventually.
• Fallout New Vegas - Don't feel like starting over on the PC version.
• Sleeping Dogs - I'll get to it eventually.
• Civilization V - I have too many games to play first.

Far Cry 3 - been playing it on and off for a while now. LA Noire (non steam version), started never finished.