Originally Posted by Chaosmax

yes they check passports but as I always travel solo I don't know if they will ask for all passports.

Originally Posted by number_6

Passport of all registered guests is checked. This is required by law so not an option for the hotel. Not sure how they treat unregistered guests

Originally Posted by nacho

It depends on the hotel occupancy rule. Some hotels allow 3 guests while some only allow 2. It also depends on whether all 6 guests are adults. All the hotels I stayed at in HK requires a copy of all passports from all the occupants.

If you don't want to register all guests, register 4, and then sneak the last 2 in (as long as you don't ask for extras stuff/breakfast).