It is unfair to humans to make text input (level 3) case sensitive when puzzle is always showing in caps. If robot recognizes characters, it becomes easier for robot to enter correct text than human.

I thought the draw-a-circle level was even more solidly in the class of much, much easier for a bot than a human. Perhaps in rejects if you draw a circle that scores 100%.

Also, did people manage to draw a circle that passed without cheating in some way?

It's bad ux to make it case sensitive