Tired of all those new-fangled graphics and dazzling eye candy on your shiny new iPhone?
Can't quite master the finicky multi-touch Nintendo controls in NES.app?
Then take advantage of those crisp high-resolution fonts on your iPhone to relive the glory days of the Great Underground Empire, or play any of hundreds of great works from the Interactive Fiction archive.
Requires a jailbroken/sshd-enabled phone to install.
To install from binary distribution, download and extract the iphoneFrotz-X.Y.tar.gz file.
Copy the resulting Frotz.app directory to your iPhone.
Create a directory /var/root/Library/Frotz/Games on your iPhone and copy your Z-Machine game data files there.
A good starting point for exploring the wealth of Interactive Fiction is here.