DUOLINGO

 Duolingo is a platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam. The app and the website are free. Duolingo also offers a premium service for a fee. As of January 2019 the language-learning website and app offer 85 different language courses in 24 languages. The app has about 300 million registered users across the world.

 The game is set up as a tree that you must slowly work through. When you get to the end, you’ll get a cute little trophy wearing a flag that represents the language you’re learning.

Each node in the tree consists of several lessons. Each lesson is a level that you must beat by answering questions until the bar fills up, with correct answers bringing the bar up and incorrect ones bringing it down (17 questions if you don’t get any wrong). The types of questions include free translation, putting together a translation with a set of given words, speaking exercises, listening transcription, and picture matching.

When you complete a node, it will turn golden and you will receive some number of the game’s currency “lingots”, which can be used to purchase various bonuses such as costumes for Duo the owl (the game’s mascot), bonus lessons (like Flirting and Idioms), and other fun things. The next row in the tree will also open up for you to do further lessons.

I tried to learn Spanish through this app. If you look at the photos below you may have an idea how the app works,you can see the visuals of types of exercises you come across.