One Fish, Two Fish, Red Fish was created with Inform and has IFID 228E1EE8-74F1-4018-A359-5C3BDFD55980. To play a work like this one, you need an interpreter program: many are available, among them Gargoyle
for Mac OS X or Windows; Windows Frotz or Windows Glulxe for Windows.
Or you can play without downloading anything by following the 'Play In-Browser'
on your web browser.