OK - so just to be clear, you have 3 weblogs:
- News
- Artikel
- Game
And when viewing one News article you want to show:
- related entries from Artikels and Games
- And also from within News weblog?
If that’s the case there are two approaches to consider:
1. Native EE code
- Create unique field groups for all weblogs
- Put a relationship field in the Artikel and Game weblogs, specifying the News weblog as the source.
- Each entry in Artikel and Game would be assigned to a News entry.
- On the news entry page, pull these entries with two reverse related entries loops
{exp:weblog:entries weblog="news" orderby="date" sort="desc" limit="1"}
{customfield}
{reverse_related_entries weblog="game" orderby="date" sort="desc" limit="5"}
{customfield}
{/reverse_related_entries}
{reverse_related_entries weblog="artikel" orderby="date" sort="desc" limit="5"}
{customfield}
{/reverse_related_entries}
{/exp:weblog:entries}
That takes care of 2 out of the 3. The remaining question is for pulling other News entries, since you are already looking a News entry. Relationships are more commonly used to pull content from other weblogs. You could use them here but since you can only relate one entry to one other entry it almost seems like categories might be a better fit - so each entry would be categorized then you could use the related categories mode to show other News entries from the same category as the one being viewed.
2. Using Playa
This might be a good use for the 3rd party Playa extension - which would allow you to create one relationship field in the News weblog, specify all three weblogs as possible sources for relationships, and choose them all from the News article they should appear with.
Or you could create 3 playa fields, one each for the individual weblogs.