I have made lots of progress, but there is still important stuff left to do. You can actually drop the bricks in now, and the game checks if they are correct. A (currently quite generous) time limit is included¸ and you lose if it drops to zero. The game now highlights the important words to make it a bit easier, but there is still one important issue left to fix: the game's difficulty curve hits a cliff when it starts using Hindi and Chinese. I think I will have to add some kind of in-game reference to help (or at least give a translation when a brick is incorrectly placed), and possibly limit them to the 'hard' difficulty. I also need to add winning and losing screens and a score indicator.

711 lines so far. Good luck everyone!