Add a JavaScript function where the user has to have the "correct" answer before going to the next mission.

[izayevisuals]

This JS function has to be applicable to every mission-page.

[bpires]

Just saw this after I talked to you! 😅

Yes, it's essential to prevent the user from going to the next mission without answering the previous one.

Another approach is to change the button to "Submit & go to the next mission". Hence you'll have two options, submit and check your answer on the spot, or submit and check your scores at the end (presuming you implement a table of scores).

Those are two different ways to design the game:

• as a multi-level game (you only go further if you got the previous one right)
• as a set of problems (you answer each problem and check your scores at the end)