How do I go back to a specic part of the program?

I would like to keep going back to certain parts of the programs. Do I
need to do something special or is there a command I can use that would
allow me to go anywhere I want?

So far the only command I have in my game is walk.
The enemies so far are rat frog rabbit and snake


Please help me I am stuck and I cant figure out how to move forward
without that.

Attachments:
http://www.ruby-forum.com/attachment/6929/program.rb


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