-<para>The fourth question, new in SST2K, sets your game options. A
-blank answer or 'fancy' enables all SST2K features. The option
-'plain' approximated the original CDC 6600 FORTRAN game from UT Austin
-and disables a number of features: Tholians, planets & dilithium,
-deep-space-probes, Klingon ramming and movement, time-warping through
-black holes, death-ray upgrade, inhabited worlds. The option 'almy'
-approximates Tom Almy's C translation from 1979, disabling base
-shields, time-warping through black holes, and inhabited
-worlds.</para>
+<para>The fourth question, new in SST2K, sets the wayback machine. A
+blank answer enables all SST2K features. Given a year, it will disable
+features not implemented in that year or earlier. The year
+'1973' approximated the original CDC 6600 FORTRAN game from UT Austin.
+Here is a mapping of years to features:
+
+<variablelist>
+<varlistentry>
+<term>1974</term>
+<listitem>Planets and dilithium mining</listitem>
+</varlistentry>
+<varlistentry>
+<term>1979</term>
+<listitem>Tholians and their webs.</listitem>
+</varlistentry>
+<varlistentry>
+<term>1980</term>
+<listitem>Deep-space probes.</listitem>
+</varlistentry>
+<varlistentry>
+<term>1981</term>
+<listitem>Bad guys do tactical movement.</listitem>
+</varlistentry>
+<varlistentry>
+<term>1982</term>
+<listitem>Bad guys can ram you.</listitem>
+</varlistentry>
+<varlistentry>
+<term>1997</term>
+<listitem>Death ray gets an upgrade.</listitem>
+</varlistentry>
+<varlistentry>
+<term>1998</term>
+<listitem>Automatic generation of self-destruct password.</listitem>
+</varlistentry>
+<varlistentry>
+<term>2004</term>
+<listitem>Upgraded shields for bases, and chance of time-waeping through a black hole.</listitem>
+<varlistentry>
+<term>2005</term>
+<listitem>Our ship is bracketed in the chart/</listitem>
+</varlistentry>
+</varlistentry>
+<varlistentry>
+<term>2006</term>
+<listitem>Logic for inhabited worlds and Klingon captures.</listitem>
+</varlistentry>
+<varlistentry>
+<term>2007</term>
+<listitem>Automatically update the long-range scan when displaying the chart.</listitem>
+</varlistentry><varlistentry>
+<varlistentry>
+<term>2010</term>
+<listitem>Use color in interface.</listitem>
+</varlistentry>
+<term>2013</term>
+<listitem>Defeated Klingons can be captured.</listitem>
+<varlistentry>
+<term>2014</term>
+<listitem>The cloaking device.</listitem>
+</varlistentry>
+<varlistentry>
+<term>2019</term>
+<listitem>Consistent dot-filling in the galaxy chart.</listitem>
+</varlistentry>
+<varlistentry>
+<term>2023</term>
+<listitem>Alphameric coordinates.</listitem>
+</varlistentry>
+</varlistentry>
+</variablelist>
+
+<para>Some caveats apply. The development history of this game is obscure; some
+years of introduction have had to be guessed, and we have chosen guesses to
+make support as many interesting wayback options as possible. Some options
+are not affected by the wayback setting - notably, the TUI interface is always
+available even though it wasn't written until 2005. Some early features,
+notably "clockface" course setting, couldn't be reconstructed.</para>