<DIV><DIV><DIV><P>Once you've mastered the easy puzzles, it's time to take it up a notch!</P><P>Features: </P><P>-200 medium-level puzzles using addition, sumtraction, multiplication, and division</P><P>-Introduction and instructions by Will Shortz</P><P>-Puzzles range from 4-by-4 to 6-by-6<BR><BR></P></DIV></DIV></DIV>