Duolingo has changed since about 2 months ago but now there can be a new type of practice the duo dual my idea is you can challenge a friend (or computer) via internet or split screen and see who can get the most questions right there will be 4 modes easy out of 20 questions,casual out of 30,hard out of 50 and nightmare out of 50 timed 45 mins. you get 5 Lingots if you win and it can be a great way to practice.
P.S it will be WAYYY less BOOORING than the ones that already exists.
P.P.S what does P.S and P.P.S stand for?
Here are more details: http://blog.duolingo.com/post/62723181502/duolingos-inaugural-hackathon