exits = [[1,4,7], [0,2,9], [1,3,11], [2,4,13], [0,3,5],
  [4,6,14], [5,7,16], [0,6,8], [7,9,17], [1,8,10],
  [9,11,18], [2,10,12], [11,13,19], [3,12,14], [5,13,15],
  [14,16,19], [6,15,17], [8,16,18], [10,17,19], [12,15,18]]
hazard = [null] * 20
emptyRoom = function()
	while true
		room = floor(rnd * 20)
		if not hazard[room] then return room
	end while
end function
for i in range(1, 2)
	hazard[emptyRoom] = "bat"
	hazard[emptyRoom] = "pit"
end for
hazard[emptyRoom] = "wumpus"

print "*** HUNT THE WUMPUS ***"
print "-----------------------"
curRoom = emptyRoom
arrows = 5

checkWumpus = function()
	if hazard[curRoom] == "wumpus" then
		print "You find yourself face to face with the wumpus."
		print "It eats you whole."
		print "GAME OVER"; exit
	end if	
end function

while true
	print "You are in room " + curRoom + "."
	checkWumpus
	for r in exits[curRoom]
		if hazard[r] == "wumpus" then print "You smell something terrible nearby."
		if hazard[r] == "bat" then print "You hear a rustling."
		if hazard[r] == "pit" then print "You feel a cold wind blowing from a nearby cavern."
	end for
	print "Tunnels lead to: " + exits[curRoom].join(", ")
	print "You have " + arrows + " arrows."; print
	while true
		m = input("M)ove, S)hoot, or Q)uit? ").lower
		if m == "q" then exit
		if m != "m" and m != "s" then continue
		target = input("Which room? ").val
		if exits[curRoom].indexOf(target) == null then
			print "Cannot get there from here."
		else if m == "m" then
			curRoom = target
			if hazard[curRoom] == "bat" then
				print "You have entered the lair of a giant bat."
				curRoom = emptyRoom
				print "It picks you up and drops you in room " + curRoom + "."
			else if hazard[curRoom] == "pit" then
				print "The ground gives way beneath your feet."
				print "You fall into a deep abyss."
				print "GAME OVER"; exit
			end if
		else
			arrows = arrows - 1
			if hazard[target] == "wumpus" then
				print "Congratulations!  You shot the wumpus!"
				exit
			end if
			print "You missed."
			if rnd < 0.75 then
				print "The wumpus wakes from his slumber."
				hazard[hazard.indexOf("wumpus")] = null
				hazard[emptyRoom] = "wumpus"
				checkWumpus
			end if
			if arrows == 0 then
				print "As you grasp at your empty quiver, "
				print "you hear a large beast approaching..."
				hazard[curRoom] = "wumpus"
				checkWumpus
			end if
		end if
		break
	end while
end while