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> Thank you for your answer. The Prisoner Dilemma is just for Inquisit 5. Is there a possibility to get it for Inquisit 4?

You would have to take the Inquisit 5 version, and then work through the code replacing all Inquisit 5-specific syntax features with Inquisit 4 syntax compliant equivalents (as far as any exist).

Based on the resource-competition aspect you mentioned, this task might be another option to use either as-is or as a starting point to design your own:
https://www.millisecond.com/download/library/v5/chicken/dovehawk.manual

Thank you for your answer. The Prisoner Dilemma is just for Inquisit 5. Is there a possibility to get it for Inquisit 4?

The others are not what i am looking for. I am looking for a social dilemma which is in a environmental context, e.g. fishing (2 Persons need to decide if they want to fish for themselve, but if both fish to much, there won't be more fish) 

There is a script for the classic prisoner's dilemma, maybe that's an option or offers you a starting point to create your own:
https://www.millisecond.com/download/library/prisonerdilemma/

Other adjacent procedures would be
https://www.millisecond.com/download/library/dictatorgame/
https://www.millisecond.com/download/library/ultimatumgame/
and
https://www.millisecond.com/download/library/responsegame/