When it rains in Gothenburg, the bus is the best way here, as bus 90 stops at Gråberget a minute or two from the door. Travelling by tram 3 or 11, you get off at Mariaplan and have a 5–8 minute walk uphill. Drivers will find paid parking right by the entrance.
There are no scary rooms in Gothenburg. The Detectives and Hotel Shakespeare, for ages 18 and over, are the hardest, both rated Medium/Hard, while The Casino Heist is the easiest and The Chapel falls in between. Available times in the calendar can be booked online, even on the same day. Allow 90 minutes from arrival until you move on.
Then fill the rest of the day under cover. The same trams take you to the Maritime Museum & Aquarium at Stigbergstorget. Röda Sten Konsthall at Klippan, a 20–30 minute walk away, is housed in an old boiler house beneath the Älvsborg Bridge. Eat at Stora Saluhallen or Feskekôrka, or look out over the city from about 220 metres up at Gothenburg View in Karlatornet.