Copy that to a file and then: "base64 -d blah.txt > worms.com"
Make sure there are no spaces in the beginning of the lines.
This is from the original document:
"This is a version of the worm game for two players.
Game objective is to stay alive longer than the other worm!
You die if you eat yourself, ie. you are going RIGHT and you press LEFT.
Move the worm with the following keys:
PLAYER A: (topmost worm)
W
A D
S
PLAYER B: (lower worm)
I
J L
K
Winner is indicated by player letter, "A" or "B".
An even game is indicated by a "C". An even game means that the worms
ate each others heads, and nobody won."