Metal gate

The following types of gates are primarily made of metal:
 * Numbered gate: gates that lower once a certain number of tasks have been done
 * Switch gate: gates that can lower and raise when switches are pressed
 * Iron fence: gates made of a row of iron bars that only narrow objects can fit between

The following types of gates include metal in their design:
 * Electric gate: in, these gates are metal coiled bars carrying an electrical current. In and , these gates are florescent lamps supported by a metal frame.
 * Ice wall: gates made of a coiling tube covered in ice supported by a metal frame.
 * Crystal wall: gates made of a flat sheet of crystal held in place by two large metal clamps.
 * Reinforced wall: gates made of concrete with rebar sticking out from either side.