#Do it as a Cops n Robbers

You'll need the following:

1. I wouldn't limit the language to those, but rather those with an Esolang page, or on wikipedia's list of languages. The language, however, must be specified by the cop.

2. I recommend explicitly saying that you must write your own submission

3. The challenge they choose must have a positive score and not be closed

4. The robber needs to find any challenge that the submission solves.

Then, if you have your own code you want people to solve, you can simply add it!

Do it as a Cops n Robbers

You'll need the following:

1. I wouldn't limit the language to those, but rather those with an Esolang page, or on wikipedia's list of languages. The language, however, must be specified by the cop.

2. I recommend explicitly saying that you must write your own submission

3. The challenge they choose must have a positive score and not be closed

4. The robber needs to find any challenge that the submission solves.

Then, if you have your own code you want people to solve, you can simply add it!