Case H in Montola, M et al ~ Pervasive Games

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They discern crossmedia games from multiplatform games.
Crossmedia games are “played across different devices and media channels and that emply a wide variety of gameing devices and media channels in the game play, including state-of-the-art mobile and stationary computing devices as well as more traditional communication and information channels such as television broadcast or print media.” Lindt et al 2005
Multi platform games: for example GTA3 is available on PC, PS3, and XBOX
“[In crossmedia games] different tasks are performed on different interfaces. This is supposed to generate and support interesting gameplay across different media.” Lindt 2007
“[Epidemic Menace] was situated in tangible reality, taking place not just on the various interfaces, but also between them.”