Entry - Turnstile
: Subway systems like the MTA use turnstiles to validate farecards.
This is likely a reference to the cryptographic from the video game Bioshock . turnstile entry
If you are looking for the solution to the puzzle in the game: : Subway systems like the MTA use turnstiles
The modern turnstile is no longer an island; it is a hub of connectivity. it is a hub of connectivity.