UNO is hard, even for a single player. Demaine, E. D.; Demaine, M. L.; Harvey, N. J. A.; Uehara, R.; Uno, T.; and Uno, Y. Theor. Comput. Sci. (TCS), 521:51-61, 2014.
UNO is hard, even for a single player [link]Paper  bibtex   
@article{ dblp1863507,
  title = {UNO is hard, even for a single player},
  author = {Erik D. Demaine and Martin L. Demaine and Nicholas J. A. Harvey and Ryuhei Uehara and Takeaki Uno and Yushi Uno},
  author_short = {Demaine, E. D. and Demaine, M. L. and Harvey, N. J. A. and Uehara, R. and Uno, T. and Uno, Y.},
  bibtype = {article},
  type = {article},
  year = {2014},
  key = {dblp1863507},
  id = {dblp1863507},
  biburl = {http://www.dblp.org/rec/bibtex/journals/tcs/DemaineDHUUU14},
  url = {http://dx.doi.org/10.1016/j.tcs.2013.11.023},
  journal = {Theor. Comput. Sci. (TCS)},
  pages = {51-61},
  volume = {521},
  text = {Theor. Comput. Sci. (TCS) 521:51-61 (2014)}
}
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