The goal of this group is to teach a language learning method. When we say that you 'play' this method, it's because language learning is a creative process and grammar is like an instrument you play. Conversation is a sport, like tennis, or a martial art, and that's second meaning of how language learning is 'played'.
There is no app where you fill in blanks to win gold coins; that's not what we're saying by 'playing'.