Add quizzes by input special code

Yes, you can make a course like that with SL360.

First, insert a Text Entry Field for the user to enter the code. 

When you insert any data-entry field, SL360 automatically creates a variable. The variable "remembers" the entry throughout the course. Thus, you can use the variable in trigger conditions to control what happens based on which code was input.

There are different ways to control what the user accesses. It's your decision how to set up your course so the users access the quizzes you want them to. Here are a few examples of what's possible:

• You could give the course a custom menu slide that has buttons to access each quiz. The buttons for the extra 2 quizzes could have an Initial State of Hidden. Triggers could change those buttons to Normal with the condition that the variable value equals the appropriate code. 
• To send the user down different paths from one slide, add triggers that jump to different slides with conditions based on the variable value. Here's an example of that type of trigger:

• • • This post might help you understand this. It includes a demo file, so you can see how the triggers work.

Finally, based on which code was entered, you could direct the user to different Results slides. 

• If each quiz has its own Results slide, the final Results slide could score all of the appropriate quizzes. 
• Be sure that only the final Results slides are used for tracking.

These User Guide articles have more information: 

• Conditions: https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-triggers#conditions 
• Data entry fields: https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-data-entry-fields 
• Variables: https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-variables