Collision example key

Anyone got a key for a program that teaches/shows how map collision work? Thanks. i already made a map collision, but it's super glitchy and i need help...

Perhaps one of the many other threads on the same subject will help you. https://smilebasicsource.com/forum?fpid=10102#post_10102 is one with a full solution. As you have not provided any code or specific problem, there is no reason that your question is of particular need for answer.

I would prefer the key, because with the key i can see the code in action and with that i can fix my code so it will work