I'm not sure about all 50 but a recent poll states that Halo 1 (combat evolved) is by far the most popular. you have to buy it though, sorry. However you can get the custom edition from this site:
http://download.cnet.com/Halo-Combat-Evolved-Custom-Edition/3000-7441_4-10292205.html?tag=mncol;pop
Sorry but i cant give out my CD key.
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To play Jezzball online you can go to Jezzball Net, Game Top, Just Online Games, Arcade Cow, 1888 Free Games, HTF Games, Direct Hit and Games Remixed.
One might find the top online MMORPG games in specialized sites such as mmobomb, mmorpg, mmohuts, gamigo, and many more gaming sites that offer MMORPG games.
1.World of WarCraft
Here are a few online Pokemon games you should try out.UnovaRGPokemon LegendsPokemon VortexPokemon Tower DefenseGPXplusDelugeRPGPokemon LakePokemon Pets
My Favourite free online games website is noagelimit.webs.com. It is excellent and has lots of addicting games. The website is not on search engines, you have to type it into the long address bar at the top of the page.