Zeena is the fourth boss of the Nintendo 3DS version of Sonic Lost World, serving as the recurring boss of Frozen Factory.
Zeena is encountered at the end of Frozen Factory where she sits atop a giant snowman in the corner of a blizzard-filled arena. Over the course of the battle, wind will be blowing against Sonic, pushing him away from Zeena, though he can run against it to reach her. It won't be easy, as smaller snowmen will swarm the arena and try to run into Sonic to cause damage. Upon reaching the snowman, the player must use a Homing Attack on the blue circle three times to rescue an Ivory Wisp, allowing the player to use Ivory Lightning to climb up to Zeena and inflict massive damage on her, eventually defeating her. If the Color Power runs out, the player can get another Ivory Wisp by attacking the snowman again.
This battle is repeated in Lava Mountain Zone 2, preceding the battle with Zor. In this rematch, Zeena has more health and her attacks are harder to avoid.