Dynasty Warriors 4 is a hack and slash video game and the fourth installment in the popular Dynasty Warriors series. Dynasty Warriors 4 was developed by Omega Force and is based on a series of books called Romance of the Three Kingdoms, written by Luo Guanzhong. As the series has progressed, it has strayed further from the actual plot of Romance of the Three Kingdoms but instead has given the user more input on how the storyline progresses. Originally released on the PS2 in March 2003, it was later ported to the Xbox in September of the same year and, in 2005, ported to the PC under the name Dynasty Warriors 4 Hyper.