Bottom 3-5 item main navigation with "more"

I'm about to design a responsive mobile web UI with bottom navigation with 5 items of which the last one is the More... item that should open a list of additional ones that are secondary to user processes.

What would be the best cross mobile platform way of displaying these additional items? Should they be opened as

• a full screen list,
• a bottom aligned list going as high as there are items
• a popup bottom-right aligned menu or
• any better way?

I don't know which way would be best? Each of these items will completely switch application window context so full-screen or bottom full-width list seem to be the most appropriate?