Most addicting game

[SmokeyCR]

Braid, for sure ♫
The replay value is almost 0, but when I played it for the first time, I just couldn't bring myself to stop. Collecting puzzle pieces was so much fun 

[sharkruisher]

Being into music, Guitar Hero and Rock Band helped me get into gaming as well. Could not stop playing these games from the release of GH III. That feeling of being a rock star 

[Stepcore]

Doom brah, the game is just perfection.

[ethinthenougathorn]

Warcraft3, No Man`s Land and surprisingly super ghoulsnghosts

[Joni]

Not quite what this thread is about, but this is my favourite flashgame, that I enjoyed a lot. I like games that basically follow a very limited set or rules and are still quite hard/make you think, hence z-rox is a brilliant game, as it literally is a very one-dimensional game:

https://www.kongregate.com/games/evildog/z-rox

If you get stuck, dont google answers. Drawing helps a lot and finally figuring it out after staring at it for a long time is so rewarding.

[xDOMdaBOMx]

Crash Bandicoot series, I speedrun 2/3/Bash/CTR/Twinsanity, and have probably done like 3000 run throughs combined

[petsson12]

agar.io, it's so good 

[Katz]

agar.io, it's so good 

Donald Trump, anyone?

OT: Tetris (mostly Pac Attack), Super Meat Boy, and CS:GO pretty much

[TOKETMEK]

If this isn't the most addicting game of all time then I don't know what else is

[ColdWarrior]

I surprised that no one even mentioned Terraria. If building houses wasn't mandatory, i could go on and on with it.
Also Alien Shooter 2, Nox, HoMM, Heavy Metal is fun, too, and good old school RPGs like Sacred.