Here are some actual screenshots from the game!
Puzzles can be generated to suit your ability...or time allowance!

Here's Killer:

or for something more tricky...

Japanese Characters can be quite a challenge!!

Or how about Colour Mode...Nice for the kids this one - or a pretty diversion

KIller can offer hints...

and can be any colour you desire...

Solver mode will solve ANYTHING! - even a blank grid (though the solution 
Chrismas special version just added!!