Ok, so thinking it over again I see some difficulties:
- like I told, one images belongs to multiple highscore listing (in different 'categories');
- one player has multiple highscores (so highscores are childeren of the player?
>>> The best would be that if somebody sends in their first highscore, that they will get a user account at wordpress with the name and emailaddress they fill in. When they later want to add more highscores, they need to login. How to achieve that?
- How can we let a user fill in 3 highscores (example: one for 'best word', one for 'wordcount' and one for 'roundscore) in only one CRED Form? Because those 3 highscores are all different post in the CPT 'Highscores' right? And all these 3 have the same screenshot (the prove of their highscore)…
So as you understand, I'm a little lost here 
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Kind regards,
Willem