Block-computer / monitor, where you need to enter the correct password

there exists text input block which u can use to save variable of password (which doesn't works on servers unfortunetly) 

U also can create 1 button for each number and by pressing on it change variable of password

Also in MCreator exists customizable conditions under which different interface elements appear - u can use it to show text "invalid password" or vise versa

The gui wiki is at https://mcreator.net/wiki/gui-editor. Videos are at https://www.youtube.com/watch?v=3gmFruTGCU4&t=1s and https://www.youtube.com/watch?v=uRflJmjgvak. With what the person above said, in more technical terms:

1. Create a GUI
2. Add a text input named password and a button named whatever
3. Create a procedure that says GUIpasswordcheck.
4. in the procedure do this:

                     If: get text input from textfield password = password

                     Then: Close GUI for event/target entity if it is player

                       open _ GUI for player

                   else: Return incorrect password to player.

-PixelKid