Rather than “understanding”, you have to interpret the theme; “multiple applications” can mean many things, and all of them valid.
For instance, you can do a game in which you are the head of HR and there are many applicants to the job.
Or a “hacker” game where you have to run multiple applications/programs on remote servers to hack a company.
Or even a game that, for whatever reason, you have to apply many times sunscreen on the back of hairy men.
Just as you can describe your game as “many applications [of]”, it will be fine.