Browser based free games
Play free and free-to-play games designed to be played direclty in a browser (this includes both browser-based games and flash games)
Here are some of the best browser games you can play directly online: MMORPGs, collectible card games, strategy games and more. Browser games usually doesn't require nothing more than an updated browser (Chrome, Firefox, Edge, Opera, etc.) and are playable on any PC or Mac. Some of them may require a Flash plugin.

Goodgame Empire
strategy / MMORTS
Good Game Studios

The Monster Inside
adventure / visual novel
Random Seed Games

RPG MO
RPG / MMORPG
Marxnet

Empire Universe 3
strategy / MMORTS
Looki Publishing

Drakor
RPG / MMORPG
Drakor Dev Team

Batheo
strategy / MMORTS
Clap Along

Lost Pig
adventure / interactive fiction
Admiral Jota

Hattrick
simulation / management
Hattrick Limited

Pixel Town
strategy / city building
automatonvx

Strip the Difference
puzzle
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Might & Magic Heroes Online
RPG / MMORPG
Related Designs

Monster Slayers
action / brawler
Nerdook

Forever Space
adventure / point & click
Pinhead Games

FARA
RPG / roguelike
Brian Is Creative

The King's League: Odyssey
strategy
Kurechii

Circus Hidden Objects
puzzle / hidden object
zygomatic

Bejeweled REMAKE
puzzle / tile-matching
szewczyk

Bit Heroes
RPG / MMORPG
Juppiomenz

Work!
simulation / typing
Moitapecha

Daily Crossword
puzzle
zygomatic

Cut the Rope Time Travel
puzzle
ZeptoLab