Professional Baseball Spirits 4 is a baseball video game published by Konami for the PlayStation 2 and PlayStation 3 in Japan on May 1, 2007. It is the sequel of Pro Yakyū Spirits 3.The game only features all 12 Nippon Professional Baseball teams, and both the Pacific League and Central League All-Star teams (circa 2006, but with changes made for traded and/or retired players).The difficulty level for the game is adjustable. The easiest mode will appeal to younger players who have probably never played a baseball game before in their lives, and the hardest mode—known as Spirits Mode—will give even the most experienced and advanced players a challenge with superior AI. Other modes can be selected in a sort of pseudo-gameplay sliders mode. For instance, gameplay speed can be increased, as well as pitch speed (which can be set to "real" speed).