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Multiple possible solutions. There's an option to test solve your puzzle before you submit it: this is the best way to check for and eliminate ambiguous squares. Thank you for the puzzle!

Really pure guessing job.

You should test your puzzle before submitting, can someone provide a hint?

Got there by luck. Think of circles and its sort of symmetrical, well sort of.

**SPOILERS**

R2 C5,6 ; R9 C5,6
Corners are all the same: R1,C2 ; R2,C1.

Thanks Strigoii, couldn't have done it without your help.

Thank you for the spoilers. I don't think it would have been possible without them + a little guessing.

Thanks Strigoii.

Absolutely terrible!