Stratego Fortress (2007)

Stratego Fortress is a 3D variant of Stratego.
Each of the two players control a fortress with 3 levels and also some noble knights to invade the opposite fortress. Goal is to capture the adversarial flag.
There are secret passages to discover, pitfalls to avoid, deal with powerful wizards and sneaky dwarfs. Beware also of the the princess or you will succumb to her charm. Only the bravest will win.