WPC 2015/Round 1
Duration: 50 minutes. Total point value: 400 points. Round winner: Ken Endo (Japan), 560 points.
All puzzles in this round were written by Andrey Bogdanov.
As a surprise for competitors, all puzzles in this round were geometrically cylindrical, printed both-sides, then glued to be Möbius strip-shaped (interestingly, on this Wiki's definition, the puzzles themselves were not Möbius strip-shaped, in terms of the grid geometry.) All these details were not disclosed until the round started; on the instruction booklet, it looked like just another "classics" round.
The hardest part was actually drawing a proper straight line on the strip.