I could easily come up with a 500 words piece on the excellence Passage, but I wont. It would simply take a bit from joy of discovering its beauty by yourselves and I really wouldn't want to spoil anything for you. Knowing that it's an incredible, unique, moving and handily free game that can be played in less than 5 minutes should be all the information you need. Or, to put it bluntly, simply trust me and go download Passage right after you wash your hands.
Related @ Gnome's Lair: Sam & Max episode 104 gone freeware, Pac-Txt, HPL's Commonplace Book Project