All games in the Edplus app are free. Just click "Play" in the app to view available games - new games are added weekly!
Games need to be unlocked using gems. You can earn gems by answering questions in the "Learn" section. You can view your current gem balance in the top right corner of the "Play" screen.
Just click on a game to see how many gems you need to unlock it.
Note: even if there is a padlock on the game, you can unlock it if you have enough gems!
Watch this video explanation of the games section: