There are countless websites offering free browser-based games. While it's impossible to list them all, here are popular categories and top sites to explore:
Classic Arcade Games
PCH Games:pch.com/games - Mix of classic arcade, puzzle, and card games.
Arcade Spot:arcade-spot.com - Huge collection of classic arcade games playable in-browser.
Free Arcade Games:freearcadegames.com - Features Pac-Man, Tetris, Galaga, and more.
Puzzle Games
Kongregate:kongregate.com - Large library of puzzle games, platformers, and more.
Armor Games:armorgames.com - Variety of puzzle, action, and strategy games.
Addicting Games:addictinggames.com - Wide range of puzzle, arcade, and strategy titles.
Card Games
CardzMania:cardzmania.com - Free online card games including Solitaire, Hearts, and Spades.