Bejeweled, Candy Crush and other match-three games are (NP-)hard. Gualà, L., Leucci, S., & Natale, E. In 2014 IEEE Conference on Computational Intelligence and Games, CIG 2014, Dortmund, Germany, August 26-29, 2014, pages 1–8, 2014.
Bejeweled, Candy Crush and other match-three games are (NP-)hard [link]Paper  doi  bibtex   
@inproceedings{DBLP:conf/cig/GualaLN14,
  author       = {Luciano Gual{\`{a}} and
                  Stefano Leucci and
                  Emanuele Natale},
  title        = {Bejeweled, Candy Crush and other match-three games are (NP-)hard},
  booktitle    = {2014 {IEEE} Conference on Computational Intelligence and Games, {CIG}
                  2014, Dortmund, Germany, August 26-29, 2014},
  pages        = {1--8},
  year         = {2014},
  crossref     = {DBLP:conf/cig/2014},
  url          = {https://doi.org/10.1109/CIG.2014.6932866},
  doi          = {10.1109/CIG.2014.6932866},
  timestamp    = {Wed, 16 Oct 2019 14:14:56 +0200},
  biburl       = {https://dblp.org/rec/conf/cig/GualaLN14.bib},
  bibsource    = {dblp computer science bibliography, https://dblp.org}
}

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