we turn coffee into puzzles

Worms Sudoku The numbers 1--9 must each appear exactly once in each row, column, and block. In addition, each worm should consist of an increasing sequence of numbers from tail to head. For example, a worm of length four could contain the numbers 2, 5, 6, and 8, in that order from tail to head. Green worms have their heads marked with eyes, but blue worms don't; you have to figure out their direction. Appeared in +Plus Magazine, part of the Millennium Mathematics Project based at Cambridge University, Issue 41, December 2006.