As a Language teacher, I highly recommend Alter-Learning games. They focus exactly on the contents you want your students to learn and much more! Apart from that, they can communicate among themselves while playing and interacting. They will also be able to improve their skills in listening, reading, speaking and writing. The fantastic use of visual aids is of great support for them to learn. My students really loved the experience!
Game description
You control a sheep (or some pet, multiple skins) and run around trying to eat crops to gain a larger flock. There are other AIs or players doing the same in Pets Farm, and if you have a larger number, you absorb their flock. Otherwise, game over. If you run into a farmer, it’s also game over.