To get Tile C: Start the generator, by putting the fuse from thew box (opened by typing the number on a coin) in its place (outside of the radio room). The tile C will appear above the radio room in a portal. Don't use thew spoon before collecting the tile. I think it may make you lose the tile... I'm not sure of it.
 "Xeno Tactic"){kind=icon}
 "Submachine 1: the basement"){kind=icon}