mophun gaming engine is available also for Microsoft Smartphone
"Users of Microsoft Smartphone have ability to use several platforms for running games: not only Java (in form of an add-on program) but also native games and last, not least: .NET (not available for Symbian).

mophun is a premium gaming system today available on Sony Ericsson T226, T230, T300, T310, T610, Z600, P800, N-Gage, Symbian 7650, 3650, Motorola A920, MS Smartphone/WinCE PC handsets"