What I mean by this is pretty simple. In the films, Jason’s hockey mask used the same pull in 3 and 4, but a different one again in 6 and again in 7. You can look at the mask in 7 and the one in 6 and the one in 3and 4 and tell they’re all different masks.
My challenge is to take a blank 3 and try to get it as close as possible to a combination of all four masks - or in other words like a Part 7 that actually is the same mask as the one from part 3. The axe mark is a different size, the bullet hole from 6 is magically gone in 7, etc. Combine all those elements and see what you get.
