Metal Block Stair Ushape

U-shaped stairs which can be placed on any type of foundation. The stairs are the same height as a wall and can be used to traverse between floors of the building. Sheet metal is the second strongest building upgrade featuring twice the durability of Stone. The material can withstand up to 4 Timed Explosive Charges. Upgrading a U-shaped staircase to sheet metal quality requires 200 Metal Fragments.