Land generator for my game - please criticize

Miscellaneous Forums/General Discussion/Land generator for my game - please criticize

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It takes less than 1.1 seconds each time on my desktop
on my laptop (Celery 1.4GHz, 512MB ram, windows XP Home) it takes between 2 and 2.5 seconds

looking nice.

You said earlier that the game involved digging tunnels, wouldn't that be easier if there weren't tunnels there already?