This learning game is meant to help you practice your Spanish and is not intended for people trying to learn it from scratch. In fact, you need to understand a little bit of the language in order to answer the questions.
The program provides 49 lessons that you can download by clicking the appropriate link in the main frame. The tests include a study section where you can read many examples on a specific subject and games to practice what you have studied.
To import a downloaded file, click the green 'import' arrow icon in the main frame of the application. It would have been nice if this install were automatic, but it's not very complicated anyway.
Practiquemos doesn't feature particular functions to improve your learning and it could have been easily improved from a user-experience point of view.
For example when you give the wrong answer or you misspell a word, the application doesn't correct it to show you the right version. This sort of feature, while sounding simple and basic, is actually essential for students.
If you are looking to improve your Spanish, learning new words and ways to use the language, Practiquemos is a free, if somewhat simplistic, teacher.