Title: Feint in Multi-Player Games. Abstract: This paper introduces the first formalization, implementation and quantitative evaluation of \feint in Multi-Player Games. Our work first formalizes \feint from the perspective of Multi-Player Games, in terms of the temporal, spatial and their collective impacts. The formalization is built upon \textit{Non-transitive Active Markov Game Model}, where \feint can have a considerable amount of impacts. Then, our work considers practical implementation details of \feint in Multi-Player Games, under the state-of-the-art progress of multi-agent modeling to date (namely Multi-Agent Reinforcement Learning). Finally, our work quantitatively examines the effectiveness of our design, and the results show that our design of Feint can (1) greatly improve the reward gains from the game; (2) significantly improve the diversity of Multi-Player Games; and (3) only incur negligible overheads in terms of time consumption. We conclude that our design of Feint is effective and practical, to make Multi-Player Games more interesting.