Canal (2021, designed by me)
Place the four pieces inside the grid so that the empty cells form a single path between the two circles.
I made this puzzle a year ago. I wanted to release it after I've verified the uniqueness of the solution, but I couldn't afford the time to do so. I'd appreciate it if anyone can verify the uniqueness.
UPD: George Sicherman and Symen Wórld independently analyzed this puzzle and confirmed that the solution is unique. I really appreciate it!
(If anyone's interested in getting a hint or manufacturing a physical version, please DM me!)
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