Glados's orbs that kept her under "control" models come in all 4 colors purple for morality, yellow for curiosity, blue for knowledge and red for rage **Difficulty 6/10**
Rollermine
Rollermine model from Half-Life 2. *Difficulty 4.5/10*
gravity gun
zero-point energy field manipulator AKA gravity gun from Half life 2 the model is the blue version (super gravity gun) ****Difficulty 7/10****
Half-life trip mine
Trip mine from the game Half-Life 1 **Difficulty 4/10**
