Well, to be honest, free online games are not that interesting. These games are more like children, they can play a maximum of half an hour, and then bored to play them. Now the world of game industry is developing very rapidly and want to play only the newest and best. But of course, it's still interesting to play old games, I like to play GTA 5, although I would not say that it is old, this game is liked by millions of people and it will not soon become obsolete, in addition it is possible to install different mods, such as impulse mod menu, which adds the game only pluses. So I think it's better to spend money and buy the game than to play uninteresting free games.
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