247 Games
Best For: Classic games, card games, and puzzles
Adobe Flash: Required for select games online
Types of Games: Online (computer browser) and mobile (phone/tablet browser)
If you're interested in simple online versions of classic games, 247 Games is the perfect resource for you. On the home page under "Featured Games," you'll find seasonal versions of all your favorite classic games including backgammon, blackjack, checkers, chess, mahjong, solitaire, sudoku, word search, and more.
All of the games on 247 Games are completely free, and you won’t need to create an account in order to access any features. I didn’t run into any ads while I was playing games on this website.
In addition to the desktop version, you can visit the mobile version of the website on your smartphone or tablet to access the same games without having to download apps.
Pros:
Few to no ads
All games and features are free
Simple to navigate and use
Cons:
No multiplayer games
You can’t create an account to track progress