'Reboot' doesn't have to be a dirty word. Shadow Warrior is a proper old-school FPS, a riotous full-fat romp with huge guns and hordes of enemies to point them at. Not to mention a katana and one of the best first-person melee combat systems we've ever seen. A steal at £4.99, and you don't have to register on Steam if you don't want to. Expires at 18:00 this evening.