http://www.ftlgame.com/faq.html#reqs Intel Mac OSX 10.5.8+, or Linux (x86 or x86_64) the RPi has ARMv6 so not compatable.
http://en.wikipedia.org/wiki/Prison_Architect seems the RPi nowhere near meets the requirements to run:
Linux Operating system Ubuntu 12.04 or later
CPU Intel Core2 Duo 2.4Ghz / AMD 3Ghz
Memory 4 GB
Hard drive 100 MB
Graphics hardware Nvidia 8600 / Radeon equivalent (2009 era)
You do realise the RPi is not a Desktop PC replacement ??
http://www.raspberrypi.org/help/what-is-a-raspberry-pi
You appear to be under a wrong assumption of the RPi's capabilities as pointed out in your other post
http://www.raspberrypi.org/forums/viewt ... 45#p659645