Well, I checked the rules thoroughly, and nothing said you can't use the SOLUTION file as an emergency dictionary!  In fact, as you've probably guessed this program plays hangman.  The string $llama at the start consists of pairs of characters.  When split into an associative array and the keys sorted we construct $ibyx from the ordered values and get "zSuOsLrUzTdIiOcNtYzLwLoArMdAs".  This is zusrzdictzwords and SOLUTIONYLLAMA intertwined.  Change z to /, and split on the Y to get /usr/dict/words, SOLUTION and LLAMA.  The first is the standard unix dictionary, which we load if we can't use SOLUTION.  Note we ignore the first line - this comment!  The time reference is used to generate a pseudo random number in the range 0-@aardvark (the length of the dictionary).  The $number_of_the_beast is a list of all characters guessed so far (666 is just an amusing starting value).  You only get so many wrong guesses (stored in $mongoose), and then you die.  Oh, and if it couldn't load either of the 2 files it uses the word "LLAMA", chosen for obvious reasons.
aardvark
bison
cassowary
diplodocus
elephant
frog
grasshopper
hippopotamus
ibyx
jackal
kookaburra
leopard
mongoose
natterjack
ostrich
penguin
quail
rhinoceros
salamander
triceratops
ungulate
velociraptor
wildebeest
xylophagan
yak
zebra
