Impenetrable captcha

Now the captcha fugat always and everywhere, and the competition of robot generators and robot degenerators of recognizers, has led to the fact that it is often difficult for a person to read a captcha.

It can follow the path of crossword puzzles / children's dice - a drawing of a house - the answer is “a word of three letters” - and in the database for this glyph there are a dozen of the correct options “house”, “house”, “house”, “structure”, “her- with windows

PS - yes, it is necessary to dynamically impose very simple noise on the pictures. - so that the bot could not compare the pictures themselves. And recognize the non-font images of the neural network - zadolbishsya.