+ 1. The experimental deathray originally had only a 5% chance of
+ success, but could be used repeatedly. I guess after a couple
+ years of use, it was less "experimental" because the 1979
+ version had a 70% success rate. However it was prone to breaking
+ after use. I upgraded the deathray, but kept the original set of
+ failure modes (great humor!). (Now controlled by OPTION_DEATHRAY
+ and turned off if game type is "plain".)
+
+ 2. Tholian Web from the 1979 version. (Now controlled by
+ OPTION_THOLIAN and turned off if game type is "plain".)