What should a password policy contain to reduce a hackers ability to crack the passwords?

Creating a strong password is an important part of protecting your account.  The following character sets should all be included in every password:

uppercase letters such as A, B, C;                                                                    lowercase letters such as a, b,c;                                                                        numerals such as 1, 2, 3;                                                                              special characters such as $, ?, &;                                                                    alt characters such as µ, £, Æ. (Cliff) 

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.