It seems that the problem was that there was a bug in the game, it was that the boxes in the inventory were hidden from the player. Sorry about that. Now I have released a fix, download the game again, and everything will probably go as it should.
I recorded a video with details, in it the necessary idea falls out 4 in a row, but it can also fall out 3, maybe it will be different for you (the video shows the web version of the game).