Event bureau TreaT from Maastricht (active since 2002, escape games since 2018) offers no fixed rooms but mobile escape games for corporate outings and team building. The most famous game is Mystery Box: a sealed briefcase that supposedly contains 'the secret of life', where teams must find and solve puzzles within 90 minutes to crack the lock code, playable anywhere (hotel, restaurant, office). There's also Escape the City, an outdoor variant through Maastricht. The product focuses on logistics and team building for large groups (10 to 100 players), not immersion or narrative, which is why there are barely any standalone game reviews; escaperoomsnederland has too few reviews for a rating.