Usability
Interface 
User-friendliness/complexity of the tool´s interface
Straightforward, slightly old-fashioned.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
Medium.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
English.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Puzzlemaker can be used without setting up an account and thus without providing user information. However, it collects various cookies and other types of data and shares this information with third parties for operational purposes, yet refraining from selling it. Puzzlemaker also displays advertisements on its website. It has reasonable security measures in place and acknowledges users’ rights to access, modify, and delete data. Puzzlemaker observes the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
No; users need to download their creations not to lose them.
Tailorability (If so, how?) Possibility of the tool to be used for a range of different activities (e.g. to what extent you can organize a project assignment with a central activity based on this tool)
To some extent; users can choose from different puzzle types to create their own from scratch.