Teachers, students play the game. By walking around the classroom teacher while students played games to introduce and modify students still don't understand or practice is not correct.
Teachers, students play the game The teacher walks around the classroom while students play the game. To help guides Students who do not understand and fix. Or incorrect practice
The teacher the students to play the game. The teacher walked around the classroom, while students play a game to give help and solve the students who don't understand or treated improperly.