Everybody likes to play games and especially when it is not bound by time, money or space. These games are nowadays available in most of the websites. Some of these websites offer games only when the user subscribe to the sites by paying a certain amount. There are many websites which offer free online games to its users. These websites are high in demand among the users as they can play as many games online as they wish, that too without worrying about their accounts getting depleted.Another advantage of the free games online is that they do not always require a partner. A user can play games with the computer or choose to play a single player game. It is also more convenient for today’s youngsters who are brought up in a nuclear family with no companion to play along with them. Therefore, these games over net have such popularity among today’s youth. They also serve as a great pastime for those who have leisure time at home or office. Whenever they feel bored, they can just log in to internet and spend an entertaining hour with the games available there.List of popular free games onlineThe Attack of the Mutant Artificial Christmas Trees is a popular free online video game which was developed by Dallas-based Internet marketing firm, Kewlbox in 2004. It was released for online play or free download in November 2004. BlogShares is another online stock market game which is unique in its own way. It allows players to trade at any time, create their own blogs and purchase shares. This website was founded by Seyed Razavi, a graduate of the University of Manchester Institute of Science and Technology in Manchester.Cabal Online is a game which is also 3D massively-multiplayer online role-playing game (MMORPG). Other such games include Domain of Heroes (a text-based MMORPG), Urban Terror or UrT (a free online first person shooter created by FrozenSand) and Drift City (a Nonlinear driving RPG game developed by a Korean).Other popular game online include Emil Chronicle Online, Endless Ages, Heat Project, Human Age, Kutar, (Lil) Green Patch, Little Fighter Online and Pet Society. Phantasy Star Online (PSO) was initially released for Dreamcast in 2000. Due to its increasing fame, Phantasy Star Online Episode I & II were later released with some added content for Nintendo GameCube and Xbox in 2002. Other versions of this online game were released in the year 2003 and 2004.List of other free online games which gained popularity among users are QQ Sanguo, Regnum Online, Rohan: Blood Feud, Rumble Fighter, Seal Online, Shin Megami Tensei: Imagine, SubSpace (video game), Super Obama World, Syobon action, Teeworlds, Thang Online, Urban Terror, Utopia (online game), A World of My Own and Wurm Online.One must be wondering why these free online games come for free. Actually, the websites that create these free online games feature many advertisements. They get revenue from these ads.These online games can be a good way of passing time, but be careful, as they are also addictive.