Neuro-Evolving Robotic Operatives (NERO) (2007)
Author: Kenneth Stanley
NERO is a machine learning game in which the player uses real-time neuroevolution to train a team of robotic soldiers for combat. Training takes place in a sandbox, where the player can place obstacles and enemies, and change the fitness function according to the skills that should be learned. After training, players can pit their teams against other teams in combat!

Videos of NERO in action are available here:

This link is part of the NERO homepage, where you can download the game to try for yourself:
Kenneth Stanley Postdoctoral Alumni kstanley [at] cs ucf edu
Igor V. Karpov Masters Alumni ikarpov [at] gmail com
Risto Miikkulainen Faculty risto [at] cs utexas edu
Bobby D. Bryant Ph.D. Alumni bdbryant [at] cse unr edu
Real-Time Learning in the NERO Video Game Kenneth O. Stanley, Ryan Cornelius, Risto Miikkulainen, Thomas D'Silva, and Aliza Gold In Proceedings of the Artificial Intelligence and Interactive Digital Entertainment Conference (A... 2005

Real-Time Evolution of Neural Networks in the NERO Video Game Kenneth O. Stanley, Bobby D. Bryant, Igor Karpov, Risto Miikkulainen In Proceedings of the Twenty-First National Conference on Artificial Intelligence (AAAI-2006)... 2006

Real-time Neuroevolution in the NERO Video Game Kenneth O. Stanley, Bobby D. Bryant, and Risto Miikkulainen IEEE Transactions on Evolutionary Computation:653-668, 2005. IEEE. 2005

IJCNN-2013 Tutorial on Evolution of Neural Networks Risto Miikkulainen To Appear In 2013. Tutorial slides.. 2013

Multiagent Learning through Neuroevolution Risto Miikkulainen, Eliana Feasley, Leif Johnson, Igor Karpov, Padmini Rajagopalan, Aditya Rawal, an... In J. Liu et al., editors, Advances in Computational Intelligence, LNCS 7311, 24-46, Berlin, ... 2012

rtNEAT C++ The rtNEAT package contains source code implementing the real-time NeuroEvolution of Augmenting Topologies method. In ad... 2006

OpenNERO OpenNERO is a general research and education platform for artificial intelligence. The platform is based on a simulatio... 2010