There was a documentaty on Lemmings that was released a couple of months ago, you can find it in its entirety on youtube: https://www.youtube.com/watch?v=RbAVNKdk9gA&t=5935s
Lemmings is NP-hard.
It seems that the images are not available there. You can find the images here, https://lemmings-history-8b7adc.ingress-earth.easywp.com/lemmings-pictures/
Edit: Or there is this link https://lemmings-history-8b7adc.ingress-earth.easywp.com/lemmings-gamehistory/