You have many mistakes, so let's work on it a little at one time. Please check for the correct use of
plurals in your other paragraphs. Look at every noun, and ask yourself "Do I mean more than one?" If you mean more than one, then make the noun plural.
Also reveiw how to use articles - a, an, and the. Here is a video that may help.
[youtube:8CiA9BCRPBk]
1) Give up the game sometime is easy, but sometime is extremely hard like drug.
a) The subject of your sentence is apparently "Give up". But "give up" is a verb. A verb cannot be the subject of a sentence. Only a noun or pronoun can be the subject. However, you can make a noun from a verb using one of the verb's forms. Do you know what it is?
b) sometime means only one time. You mean more than one time, so it has to be a plural form.
c) a drug is not hard. The way you write this does not make sense. You have to put some words before "drug" to say what you mean.
2) Gentle addiction can depend on player personal willpower to quit.
a) The word "gentle" is not correct. An addiction never depends on willpower.
b) "Player" must be possessive, because the willpower belongs to him.
3) For example, people who have strong willpower can give up drug by themselves; they don’t need any machines or any people help.
Drug either must have the article "a drug", or be plural.
"people" must be plural and possessive.
4) If they want to quit, they will be quit.
"Will be" is not the correct form of the verb.
5) For example, like smoking most people can quit by themselves.
a) You repeat the same phrase, "for example" This is a new point, not another example.
b) I don't think you mean to say "smoking can quit". Smoking is an act of doing something, it is not a person.
“Dr. Laura - the founder of Willpower Plus has personally used these very techniques to stop smoking” (How and Why does WillPowerPLUS+ Work?).
6) Some players don’t have strong willpower can call for help, like a parent or a and friend.
Missing word in the underlined blank.
7) Parent and friend are very helpful to players who don’t have strong willpower because they can remind player when they play game. Also parent and friend can give gamer a lot of method to help them quit the game, sometime one person is not easy to quit. Because long period play MMORPG, it already stick into their mind.
Please check your plurals!!!! There are other problems in these sentences, but you must pay attention to the plurals first.
If you mean a single one, you have to precede the noun with an article, such as "the" or "a".
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