Apersonal idea is unique to the person who developed, discovered or created that idea.

True. A personal idea is unique to the person who developed, discovered or created that idea. A personal idea can only be claimed personal, if the idea was unique to the person who created it. If someone else did or had any part in helping create the idea, then it is not personal and the other person deserves credit also.

the major difference between the two is the objective and the reward of the game. candy crush has a puzzle theme with the objective of meeting a specific quota of points or objects, you are able to gain access to the next level and compete with peers on the process. on duolingo the objective is rather different, you are given sets of questions for you to answer for you to move to the next level and as for the reward, you are able to learn available language as this is an app developed to teach the user about other languages.