1 v 1 game? Upvote so Duo can see
This was posted a year ago but since now lingots are almost worthless and people are just giving them away, we need a game you can play with friends which needs lingots, this will make lingots useful again, UPVOTE so everyone can see this!
Duolingo had a feature like this called Duels. It was a 1v1 game where you had to complete exercises faster than your opponent to score points. The reason why Duolingo removed it was because they found that it negatively impacted learning. Duolingo is constantly running A/B tests to find positive learning features, so I highly doubt they would re-add something which negatively impacts learning.