Today's 'tough' killer was significantly easier than yesterday's, I thought. Does anyone know whether there is any logic in how they grade these, and what criteria they use for the gradings? Because they seem totally arbitrary to me.
I agree - I did today's in about 15 minutes with no problems. If any one wants more harder puzzles I can recommend www.djape.net. There is a new Killer puzzle posted Mon-Fri plus a weekend bonus last weekend (which I'm still struggling with!) due to too many of us finding the Friday puzzle too easy to be called 'Insane'