Each transmission is a short text written by a student — and it's full of the grammar bugs Spanish speakers make most often. Find them, fix them, and file a clean copy.
Click any word or phrase you think is wrong. If it really is a bug, you choose the correct version. If it was fine, that's a false alarm (−3 points), so read before you click. The counter tells you how many bugs are left. Stuck? End transmission reveals the ones you missed, with an explanation.