On a way more simple level, back in my days I wrote bots for flash/browser games basically by detecting specific pixels on the screen and acting according to it

On a way more simple level, back in my days I wrote bots for flash/browser games basically by detecting specific pixels on the screen and acting according to it. Sounds stupid, but with simple games this could work very well. I never got 'detected' how would they? And some of my bots easily got more skills than I ever had