-<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,
-Thingies shooting back, 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 Thingies shooting back, 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:</para>
+
+<variablelist>
+<varlistentry>
+<term>1974</term>
+<listitem><para>Planets and dilithium mining</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>1979</term>
+<listitem><para>Tholians and their webs, supercommanders.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>1980</term>
+<listitem><para>Deep-space probes.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>1981</term>
+<listitem><para>Bad guys do tactical movement.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>1982</term>
+<listitem><para>Bad guys can ram you.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>1997</term>
+<listitem><para>Death ray gets an upgrade.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>1998</term>
+<listitem><para>Automatic generation of self-destruct password.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2004</term>
+<listitem><para>Upgraded shields for bases, and chance of time-waeping through a black hole.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2005</term>
+<listitem><para>Our ship is bracketed in the chart/</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2006</term>
+<listitem><para>Logic for inhabited worlds and Klingon captures.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2007</term>
+<listitem><para>Automatically update the long-range scan when displaying the chart.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2010</term>
+<listitem><para>Use color in interface.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2013</term>
+<listitem><para>Defeated Klingons can be captured.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2014</term>
+<listitem><para>The cloaking device.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2019</term>
+<listitem><para>Consistent dot-filling in the galaxy chart.</para></listitem>
+</varlistentry>
+<varlistentry>
+<term>2023</term>
+<listitem><para>Alphameric coordinates.</para></listitem>
+</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>