Core-collapse supernovae in the hall of mirrors - A three-dimensional code-comparison projectRubén M. Cabezón, Kuo-Chuan Pan, Matthias Liebendörfer, Takami Kuroda, Kevin Ebinger, Oliver Heinimann, Albino Perego and Friedrich-Karl ThielemannA&A, 619 (2018) A118DOI: https://doi.org/10.1051/0004-6361/201833705