If you want a user to actively participate in an online activity, create a web
animation
application
page
source

application

Explanation:

A web application enables dynamic user interactivity. For example, you can create a quiz related web application where online users can answer questions and are awarded points/gifts based on their responses. Another example can be a web based multiplayer game where multiple online users can participate and try to accomplish the tasks as specified in the game.

whats

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.