We consider the Abelian sandpile model on triangular and hexagonal lattices. We compute several height probabilities on the full plane and on half-planes, and discuss some properties of the universality of the model.
Poncelet, A., & Ruelle, P. (2018). Sandpile probabilities on triangular and hexagonal lattices. Journal of Physics A: Mathematical and Theoretical, 51, 15002. https://doi.org/10.1088/1751-8121/aa9255 (Original work published 2018)