Outside Escape Utrecht offers three self-guided city games of about 2.5 kilometers each that you play without an app via a web link on your phone — no reservation, no staff, start whenever you want. The main route follows Agent Bas Beenhakker, who's made off with a secret police file; there's also a Sint Maarten route to Domplein and a Singel/Zocherpark route around craftsman Arnout who seems to have emerged from the 16th century. The riddles are tied to real facades, canals, and courtyards, with two difficulty levels and a hint ladder where the third hint always gives the answer. Reviews are sparse but positive: even Utrecht locals say they discover spots and architectural details they'd never seen before. One reviewer found the route less central than advertised and the game pricey compared to similar city games elsewhere.
A truly hilarious and enjoyable tour through Utrecht… we saw new places and our brains were happily stimulated by the questions— Fieneke, Utrecht (outsideescape.nl)
It took us to places we wouldn't normally visit and challenged us to think 'outside the box' and work together.— TripAdvisor