Upper entrance, anyone?

This is the first I have heard of this. Reading between the lines, it may be the last, too:  https://www.honeybeesuite.com/the-upstairs-downstairs-intrance-better-hive-access/

The Honey Bee Suite blog is *excellent*

See also https://www.honeybeesuite.com/a-gentle-warning-about-upper-entrances/