I've just noticed that Saw: The Videogame for the PC gamers is only £14.50 including free delivery from Shopto.net. The next cheapest price I can see online for "Saw" on this platform is £17.89 from DVD.co.uk, so there's a bit of a price hike to that level, you're saving a few quid.
I haven't played or heard much about this particular game, but I see that it gets a metascore on metcritic of 59, but a user score of 7.6/10.
"Saw: The Video Game: The story centers on Detective David Tapp who awakens in a decrepit, abandoned asylum. He has been captured by his longtime nemesis, Jigsaw. Obsessed with catching this serial killer, Tapp?mission has consumed him and ruined his family, resulting in divorce, mental imbalance, and abandonment."