Killer Su Doku

150 lethal puzzles - each with extra internal cages.
Packed with 150 mind-melting puzzles, The Times Killer Su Doku 8 offers all advanced Su Doku enthusiasts a worthy challenge.
Warm up with moderate puzzles, then steel yourself to take on the Tricky and Tough levels, before really engaging the brain and wrangling with deadly grids.
WARNING: Not suitable for amateur puzzlers!
The Times Su Doku - the original and the best.