Assassin in Ar was created with Inform and has IFID 7AD9B9E0-C854-4641-ACEE-C751F589C0B2.
To play a work like this one, you need an interpreter program: many are available,
among them Gargoyle for MacOS, Linux or Windows;
Spatterlight for MacOS;
Windows Frotz or
Windows Glulxe for Windows.
Or you can play without downloading anything by following the 'Play In-Browser'
link, using the Quixe interpreter. You'll need to have Javascript enabled
on your web browser.
