Zeena is the fourth boss that appears in Frozen Factory in both the Wii U and Nintendo 3DS versions of Sonic Lost World. Zeena is fought, of what has been given so far, at the end of Zone Two and Zone Four of Frozen Factory.
Battle
Frozen Factory Zone Two (Wii U)
The player's first encounter with Zeena is at the end of the second zone on a snow-covered planetoid. Sonic will remain inside of the snowball for the duration of this battle, so the player must rely on the limited movement options available to them in this state to survive and defeat the Zeti girl.
Zeena will bury herself into the snow and summon large snowmen out of the ground. These snowmen will not actually attack Sonic, but they need to be destroyed before you can attack. The player does this by ramming into them with the snowball, but it should be noted that if the player takes too long to do this the snowmen will sink back down and the round will reset. After destroying all the snowmen, Zeena will pop out of the last one and begin running away. This is the player's opportunity to strike: roll over her with the snowball to cause her damage.
The battle will then go through two more phases identical to this one, but with each round comes more snowmen to destroy, as well as new bomb-headed snowmen that won't actually hurt Sonic if he runs into it, but instead will reset the round. The bomb-headed snowmen aren't difficult to tell apart from the normal ones, but be careful and pay attention when charging through as it's easy to accidentally run into one of them if it pops up near the ones you need to hit.
After three rounds, Zeena is defeated and chased off.
Frozen Factory Zone Four (Wii U)
Similar to the previous boss, this one takes place on a planetoid at the end of Zone Four, this time covered in ice. Zeena will fight you herself this time, and her attack pattern is incredibly basic: She'll use a Snowman Mech head like a mace and swing it around in an attempt to smash you. It'll start out slow, but will eventually pick up speed; making it hard to get by. Zeena will also slowly move towards Sonic while spinning, so you'll want to keep your distance if at all possible. This is, of course, made more difficult by the fact you're on ice for the entire fight, but it should be managable.
Zeena can be targeted essentially at any time during this fight, but it's recommended that the player try to get in to attack her before she gets spinning too fast; making it easier to land a hit. Three hits will send her into her second phase: she'll bring down two Snowman Mech heads that she'll swing around via energy chains around the planet. The energy chains will hurt Sonic if he runs into them, so be careful. This round actually makes it easier to hit Zeena, though, as she doesn't have the Snowman Heads near enough to her while swinging them around to act as a decent enough shield! Three more hits and Zeena is chased off again.
Lava Mountain Zone Three (Wii U)
Zeena is fought as a mini-boss at the end of the first vertical-scrolling 2D tower section in the third Zone of Lava Mountain. Her arena consists of a see-saw-like platform in the center of a pool of Lava with a row of spikes along the ceiling.
Zeena's strategy consists of jumping about and pounding down on one side of the see saw, raising the other side up. If Sonic is standing on the see saw when this happens he'll be catapulted up to the spikes above; causing him damage. You can avoid this, however, by jumping before Zeena impacts.
After stomping, Zeena remains stationary for a moment. Use this opportunity to lock on to her and homing attack her to deal damage. Six normal hits are required to thaw out that little Ice Queen for good; allowing you to procceed to the next section of the stage.
Frozen Factory Zone Boss (3DS)
Zeena's boss in the Nintendo 3DS version of the game takes place in a blizzard-bombarded arena. The Zeti girl is sitting atop a large Snowman Mech at the corner of the arena. The wind is blowing against you, pushing you back away from Zeena, but you can run against it to get up close to Zeena. You'll need to get as close as you can so you can use your homing attack on the blue circle in the belly of the Snowman. But be wary: the large Snowman Mech is firing out smaller Snowman bots that will move around on the field. They'll draw Sonic's homing attack targets away from the larger Mech, and will hurt Sonic if they run into him.
After hitting the Snowman Mech enough times, it will release an Ivory Lightning Wisp that Sonic can use to deal some damage. Any Snowman Bot that he hits with the lightning grapple will turn into floating snowman heads that will fly up. Sonic can then use these heads to grapple up to a couple of conduits that he can use to attack Zeena directly: dealing massive damage.
When the Wisp runs out, simply go back to wailing on the Snowman Mech's belly. Hit Zeena and her mech enough times, and you'll eventually defeat and send her running.
Gallery
Zone One (Wii U)
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 Zeena ready for battle.  Zeena spinning around trying to hit Sonic in Act One of Frozen Factory.  Zeena using electricity to hit Sonic.  Sonic jumping over Zeena. |
Zone Two (Wii U)
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Zone One (3DS)
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 Zeena on the Nintendo 3DS version of Sonic Lost World.  Zeena facing Sonic on the on the Nintendo 3DS version of Sonic Lost World. |