Midnight Train (branchingtreestudio)

Midnight Train is a 3-dimensional first-person puzzle/exploration game set in an

abandoned subway system deep beneath a futuristic city. In Midnight Train, the
player takes on the role of a treasure hunter who is attempting to find a lost treasure
hidden away in the subway system. In order for him or her to accomplish this, they
must attempt to navigate the subway system and solve puzzles while making sure
that they are not run over by the trains in the process.