D&D. Been playing it for 30years.

Chess

Legend of Zelda. Played originally on NES....obsessed to this day

Spank the monkey !!!!

My top 3 in recent memory are:

Xcom2: I've dumped a absolutely dumb amount of hours into this game. Addictive turn based tactical combat pitting your squishy humans against sometimes utter bullshit alien odds. Randomly generate map layouts, wide variety of missions, versatile tactics and soldier classes, endlessly playable "just one more mission" feels. Robust modding community to customize everything from new character skins, refined mechanics, to total conversion mods.

Gwent: A card game based off the Witcher universe that has gone above and beyond what the simple mini game was in the 3rd game. Hundreds of cards, factions and paradigms that fit almost any play style, a rule set structure that cuts away as much 'randomness' as can possibly be done. There will always be bad card draws, but thanks to how deck composition and rules work, you can control the odds of your deck in a much more strategic way than in many other card games.

Blazblue: I like plenty of fighting games, but this one will always hold close in spite of things that might piss me off about it. Addictive, deep, snappy gameplay with a healthy sized roster of characters that all play uniquely to suit any ones needs. There is just something satisfying about honing your skill with a character(s), and going toe to toe with other people on or above your level. It is endlessly satisfying to win a match from the brink of death, or simply out playing a reading the other player. Spending hours in the training room figuring out things for the characters you play and applying them to real opponents.

chronos

World of Warcraft
Eve online

Candy Crush

Doom and Call of Duty are addicting

Ms. Pacman, JewelryKing, Cards Against Humanity.

Lords of Legend, I got to play a hotchick who could slay undead.

2048, spider solitaire, sudoku

Chess

Fallout: New Vegas

Candy Crush Saga at the moment. I used to be addicted to SIMs I was playing SIMs when the World Trade Centers went down.

backgammon

EverQuest II, and all of the Elder scrolls games. Oh and Diablo II. All PC.

Tetris. NES Golf. Not kidding. I hate real golf. But everybody would come over to our house and play our nofriendo golf game. For hours. And hours.

Cribbage and stratiggo..

really gonna expose my age and nerdity here...

EverQuest
Dark Age of Camelot
Soul Caliber
...
Minecraft
Words with Friends
NSA Crypto Challenge

I'm sure theres many I'm forgetting and GOOD because I'm a game junkie and I need to stay on the wagon...

ETA: DANGIT @RoboGraham: Civ III, Age of Empires, Empire Attack... make it stop...

ETA: Black & White (clearly the problem lies not with the games...)

Many card solitaires. I tend to always have the app open on my phone or tablet. I also have dreamed of the "Settlers of Catan" board from time to time.

FIFA games. unbelievably addictive

Cards against humanity. It's a great game.

On the casual front, CAH is the big winner. Exploding kittens is pretty fun too.

If you want to talk nerdy, I've played Magic the Gathering for years. Draft tournaments are a lot of fun and a good way to get started. All my kids play to some degree. We all play Dungeons and Dragons once a week. we also play King of Tokyo, Smash Up, Munchkin, etc.

On the video game side, I played the hell out of Burnout, Paradise City on the xbox. A sandbox driving game, what's not to love? I wish they'd make another one. On the PC side, my kids and I all played the hell out of all the Borderlands games. Playing four player co-op with them is outstanding. I built them all low end gaming rigs so it's a LAN party waiting to happen around here.

Civ 5