Hello,
I have tried to build a little forensic mission:
https://www.lefilsdelaterre.com/forensic/forensic.zip
I think it's not the most difficult mission (comparing with some stego missions), but maybe it requires a bit of patience. The challenge was to give some hints to make it feasible, without saying too much.
There is no "strange" things that would be impossible to guess, and it can be done with any computer, even a very old one.
I hope you will enjoy it!