Playing as man's best friend, bipedal wonder dog Ralph, it's your duty to protect your pet human, Lee, from sustaining injury as he obliviously sleepwalks around his home town. Don't be silly, if you just woke him up, there would be nothing to do, and where's the fun in that?It's a lot like a one-Lemming reinterpretation of DMA Design's famous suicide-prevention puzzler, only we manipulate our charge by directly shunting him out of harm's way. Sleepwalker is also notable for raising a wad of cash for the Red Nose Day charity appeal as part of Comic Relief.