How to unlock the “Freezer” skin for the XPMR “Burner” Raygun during the Christmas event.
What to do
You don’t have to finish the level after collecting a weapon part and you don’t have to get all of them in one playthrough. You can immediately quit and load the next level from the menu.
The skin can be found in the “Game Options” menu:
Thanks to ExTaZzY and MaxRadishOne for helping me find the locations.
Thanks to UrbanDeHuman for confirming that you can quit the level after collecting a present.
#1: A Smell of Petroleum Prevails
After collecting the shotgun at the end of the beach, turn left to find the tree by the water.
Facing the hill that leads you to the next area:
Collect all the decorations and bring them to the tree to open the portal:
Defeat all the enemies in the arena to receive a present:
This contains the weapon part:
#2: The Song of the Stormbringer
The tree is standing to the left of the hangar:
Press the button to turn the lucky wheel until it lands on the present symbol:
The tree is located right next to the gate that leads you to the rest of the level:
Defeat all the enemies in the arena to receive the weapon part:
#4: Roadside Picnic
It’s right next to the weapon:
Find your way through the maze while collecting keys and killing Octanian Zealots. The weapon part is waiting at the end of the maze:
#5: Crime and Punishment
Facing the building that you come out of:
Defeat all the enemies together with your armed snowman friends to receive the weapon part under the large Christmas tree in the arena:
Enjoy your new weapon skin: