There is a link in the related links that has a list of multiplayer online games, both free and paid.
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Cool games online can be found at Pogo, GSN, GameHouse and Big Fish Games. Many games are free and can be played online, while others cost a fee or may need to be downloaded.
One may find free online games by researching which free online games have the best reviews to help decide which free online game website to play. Many reviews and opinions can be found online.
Most multiplayer games contain no cheat codes. You might find unlockables and secrets though.
If searching online games, mmo kinds - then the best you can find is Pokemonpets.com It has multilingual chat, all megas, all gen pokemons and even fake megas :) Register here -- pokemonpets.com/register
There are many websites that allow one to play or download driving games online. One can find such games on 'Sport Games Arena', 'Driving Games Online' and 'Agame'.