Hi,
for some ideas on how to do things, have a look at the following site:
http://roguelikedevelopment.org/development/.
It contains lots of articles on many different aspects of rogulike development. some of it is c++ based but the ideas still stand.
Also I'd second XDG's comment about placing the increment in brackets.
Instead of
elsif ($dungeon[$start] eq '#' && $dungeon[$start] + 1 eq '#'
try
elsif ($dungeon[$start] eq '#' && $dungeon[$start+1] eq '#'
Also see cpan for some modules you might find handy,
Games-Lineofsight
Games-Maze
Games-Dice
Hope this helps.
Displeaser
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