Reverse Masyu (484)

Draw a single, non-intersecting loop that passes through the centres of all the empty cells but not necessarily through all circled cells. If the loop passes through a white circle, it must go straight through that circle, with a turn in at least one of the cells immediately before/after the circle. If the loop passes through a black circle, it must make a turn in circle, but must go straight in both cells immediately before/after the circle.

Reference: WPC 2016 (65)