The 18th World Puzzle Championship starts today in Turkey and runs through this week.
Just to give a taste of how things will go, here are three selections from the full instructions for this year, available from the official website.
Draw given number of straight lines in the circle so that the sum of the numbers in all formed regions are the same. Lines should start and end on the circle perimeter and all formed regions should contain numbers.
Place exactly two stars in each row, each column and each outlined area. Stars have the size of one cell and cannot touch each other, not even diagonally.
Hang a rectangle (possibly a square) from its corner on each nail. All rectangles should have different perimeter lengths (not necessarily different areas) and their center of gravity should always be on the line going down from that nail. Rectangles cannot touch each other, not even diagonally.
As an extra bonus, here are the two Star Battle puzzles from Turkey’s own 2009 Puzzle Championship: