diff --git a/ch09-writing-your-own-methods/ask.rb b/ch09-writing-your-own-methods/ask.rb
index 01716eb35..71eecf5d4 100644
--- a/ch09-writing-your-own-methods/ask.rb
+++ b/ch09-writing-your-own-methods/ask.rb
@@ -1,3 +1,16 @@
 def ask question
-  # your code here
+  while true
+   	puts question
+   	reply = gets.chomp.downcase
+   	if (reply == 'yes' || reply == 'no')
+   		if reply == 'yes'
+   			return true
+   		else
+   			return false
+   		end
+   		break
+   	else
+   		puts 'Please answer "yes" or "no".'
+   	end
+  end
 end
\ No newline at end of file
diff --git a/ch09-writing-your-own-methods/old_school_roman_numerals.rb b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
index ca6589f2d..fc64a1704 100644
--- a/ch09-writing-your-own-methods/old_school_roman_numerals.rb
+++ b/ch09-writing-your-own-methods/old_school_roman_numerals.rb
@@ -1,3 +1,13 @@
 def old_roman_numeral num
-  # your code here
+  puts "Oops! Try using a positive integer!" if num <= 0
+    roman = ''
+      roman << 'M' * (num / 1000)
+      roman << 'D' * (num % 1000 / 500)
+      roman << 'C' * (num % 500 / 100)
+      roman << 'L' * (num % 100 / 50)
+      roman << 'X' * (num % 50 / 10)
+      roman << 'V' * (num % 10 / 5)
+      roman << 'I' * (num % 5 / 1)
+ 
+  return roman
 end
\ No newline at end of file
diff --git a/ch09-writing-your-own-methods/roman_numerals.rb b/ch09-writing-your-own-methods/roman_numerals.rb
index 5c93b59ac..cf2ec51ab 100644
--- a/ch09-writing-your-own-methods/roman_numerals.rb
+++ b/ch09-writing-your-own-methods/roman_numerals.rb
@@ -1,3 +1,38 @@
 def roman_numeral num
-  # your code here
+  puts "Oops! Try using a positive integer!" if num <= 0
+  
+  thous = (num / 1000)
+  hunds = (num % 1000 / 100)
+  tens  = (num % 100 / 10)
+  ones  = (num % 10)
+
+  roman = 'M' * thous
+
+  if hunds == 9
+        roman = roman + 'CM'
+    elsif hunds == 4 
+        roman = roman + 'CD'
+    else
+        roman = roman + 'D' * (num % 1000 / 500)
+        roman = roman + 'C' * (num % 500 / 100) 
+  end
+
+  if tens == 9 
+        roman = roman + 'XC'
+    elsif tens == 4 
+        roman = romann + 'XL'
+    else
+        roman = roman + 'L' * (num % 100 / 50)
+        roman = roman + 'X' * (num % 50 / 10) 
+  end
+
+  if ones == 9 
+        roman = roman + 'IX'
+    elsif ones == 4 
+        roman = roman + 'IV'
+    else
+        roman = roman + 'V' * (num % 10 / 5)
+        roman = roman + 'I' * (num % 5 / 1) 
+  end
+  return roman
 end
\ No newline at end of file
diff --git a/ch10-nothing-new/dictionary_sort.rb b/ch10-nothing-new/dictionary_sort.rb
index c9893d0fd..5ca6aafff 100644
--- a/ch10-nothing-new/dictionary_sort.rb
+++ b/ch10-nothing-new/dictionary_sort.rb
@@ -1,3 +1,9 @@
 def dictionary_sort arr
-  # your code here
+  return arr if arr.length <= 1
+
+  middle = arr.pop
+  less = arr.select{|x| x.downcase < middle.downcase} 
+  more = arr.select{|x| x.downcase >= middle.downcase}
+
+  dictionary_sort(less) + [middle] + dictionary_sort(more)
 end
\ No newline at end of file
diff --git a/ch10-nothing-new/english_number.rb b/ch10-nothing-new/english_number.rb
index c0129bc4e..6bce88086 100644
--- a/ch10-nothing-new/english_number.rb
+++ b/ch10-nothing-new/english_number.rb
@@ -1,3 +1,86 @@
 def english_number number
-  # your code here
-end
+  if number < 0
+      return "Oops! Please use a positive integer!"
+  end
+  if number == 0
+      return "zero"
+  end
+  
+  num_string = ''
+  
+    ones_place = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
+
+    tens_place = ['ten', 'twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety']
+
+    teenagers = ['eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen']
+
+    zillions = [['hundred', 2],
+              ['thousand', 3],
+              ['million', 6],
+              ['billion', 9],
+              ['trillion', 12],
+              ['quadrillion', 15],
+              ['quintillion', 18],
+              ['sextillion', 21],
+              ['septillion', 24],
+              ['octillion', 27],
+              ['nonillion', 30],
+              ['decillion', 33],
+              ['undecillion', 36],
+              ['duodecillion', 39],
+              ['tredecillion', 42],
+              ['quattuordecillion', 45],
+              ['quindecillion', 48],
+              ['sexdecillion', 51],
+              ['septendecillion', 54],
+              ['octodecillion', 57],
+              ['novemdecillion', 60],
+              ['vigintillion', 63],
+              ['googol', 100]]
+              
+    left = number
+    
+  while zillions.length > 0
+    zil_pair = zillions.pop
+    zil_name = zil_pair[0]
+    zil_base = 10 ** zil_pair[1]
+    write = left/zil_base 
+    left = left - write*zil_base 
+    
+    if write > 0
+      # Now here's the recursion:
+      prefix = english_number write
+      num_string = num_string + prefix + ' ' + zil_name
+
+      if left > 0
+        num_string = num_string + ' '
+      end
+    end
+  end
+
+  write = left/10
+  left = left - write*10
+
+  if write > 0
+    if ((write == 1) and (left > 0))
+      num_string = num_string + teenagers[left-1]
+      left = 0
+    else
+      num_string = num_string + tens_place[write-1]
+      
+    end
+
+    if left > 0
+      num_string = num_string + '-'
+    end
+  end
+
+  write = left
+  left = 0
+
+  if write > 0
+    num_string = num_string + ones_place[write-1]
+  end
+
+  num_string
+end
\ No newline at end of file
diff --git a/ch10-nothing-new/ninety_nine_bottles_of_beer.rb b/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
index 801de24bd..e17325bfc 100644
--- a/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
+++ b/ch10-nothing-new/ninety_nine_bottles_of_beer.rb
@@ -1 +1,15 @@
-# your code here
\ No newline at end of file
+require './ch10-nothing-new/english_number.rb'
+
+ def pluralize(num, word)
+   num == "one" ? num + " " + word : num + " " + word + "s"
+ end
+ 
+ count = 9999
+ while count > 0
+   number_bottles = english_number(count)
+   bottles = pluralize(number_bottles, "bottle")
+   puts "#{bottles.capitalize} of beer on the wall, #{bottles} of beer."
+   count -= 1
+   bottles = pluralize(english_number(count), "bottle")
+   puts "Take one down and pass it around, #{bottles} of beer on the wall."
+ end
\ No newline at end of file
diff --git a/ch10-nothing-new/shuffle.rb b/ch10-nothing-new/shuffle.rb
index a486ad94c..383f0cdd7 100644
--- a/ch10-nothing-new/shuffle.rb
+++ b/ch10-nothing-new/shuffle.rb
@@ -1,3 +1,3 @@
 def shuffle arr
-  # your code here
+  arr.shuffle
 end
\ No newline at end of file
diff --git a/ch10-nothing-new/sort.rb b/ch10-nothing-new/sort.rb
index 44c6deb58..0374daff5 100644
--- a/ch10-nothing-new/sort.rb
+++ b/ch10-nothing-new/sort.rb
@@ -1,3 +1,9 @@
 def sort arr
-  # your code here
+    return arr if arr.length <= 1
+  
+    middle = arr.pop
+    less = arr.select{|x| x < middle}
+    more = arr.select{|x| x >= middle}
+
+    sort(less) + [middle] + sort(more)
 end
\ No newline at end of file
diff --git a/ch11-reading-and-writing/build_a_better_playlist.rb b/ch11-reading-and-writing/build_a_better_playlist.rb
index 3b31bd241..71f15f9ea 100644
--- a/ch11-reading-and-writing/build_a_better_playlist.rb
+++ b/ch11-reading-and-writing/build_a_better_playlist.rb
@@ -1,3 +1,54 @@
 def music_shuffle filenames
-  # your code here
-end
+  songs_and_paths = filenames.map do |s|
+    [s, s.split('/')] # [song, path]
+  end
+
+  tree = {:root => []}
+
+  # put each song into the tree
+  insert_into_tree = proc do |branch, song, path|
+    if path.length == 0 # add to current branch
+      branch[:root] << song
+    else # delve deeper
+      sub_branch = path[0]
+      path.shift # like "pop", but pops off the front
+
+      if !branch[sub_branch]
+        branch[sub_branch] = {:root => []}
+      end
+
+      insert_into_tree[branch[sub_branch], song, path]
+    end
+  end
+
+  songs_and_paths.each{|sp| insert_into_tree[tree, *sp]}
+
+  # recursively:
+  # - shuffle sub-branches (and root)
+  # - weight each sub-branch (and root)
+  # - merge (shuffle) these groups together
+  shuffle_branch = proc do |branch|
+    shuffled_subs = []
+
+    branch.each do |key, unshuffled|
+      shuffled_subs << if key == :root
+      unshuffled # At this level, these are all duplicates.
+      else
+        shuffle_branch[unshuffled]
+      end
+    end
+
+    weighted_songs = []
+
+    shuffled_subs.each do |shuffled_songs|
+      shuffled_songs.each_with_index do |song, idx|
+        num = shuffled_songs.length.to_f
+        weight = (idx + rand) / num
+        weighted_songs << [song, weight]
+      end
+    end
+
+    weighted_songs.sort_by{|s,v| v}.map{|s,v| s}
+  end
+  shuffle_branch[tree]
+end
\ No newline at end of file
diff --git a/ch11-reading-and-writing/build_your_own_playlist.rb b/ch11-reading-and-writing/build_your_own_playlist.rb
index 801de24bd..f0776f208 100644
--- a/ch11-reading-and-writing/build_your_own_playlist.rb
+++ b/ch11-reading-and-writing/build_your_own_playlist.rb
@@ -1 +1,7 @@
-# your code here
\ No newline at end of file
+music = Dir['**/*.mp3']
+
+File.open('playlist.m3u', 'w') do |f|
+  music.each { |song| f.write(song + "\n") }
+end
+
+puts "Finished!"
\ No newline at end of file
diff --git a/ch11-reading-and-writing/safer_picture_downloading.rb b/ch11-reading-and-writing/safer_picture_downloading.rb
index 801de24bd..87f9ffe8c 100644
--- a/ch11-reading-and-writing/safer_picture_downloading.rb
+++ b/ch11-reading-and-writing/safer_picture_downloading.rb
@@ -1 +1,29 @@
-# your code here
\ No newline at end of file
+Dir.chdir '/This_PC/Users/Joe/Pictures'
+ 
+pic_names = Dir['This_PC/F:/*.jpg']
+
+puts 'What are we calling this group of snaps?'
+batch_name = gets.chomp
+puts
+print "Downloading #{pic_names.length} files: "
+
+pic_number = 1
+pic_names.each do |name|
+
+	print '.'
+	new_name = if pic_number < 0
+		"#{batch_name}0#{pic_number}.jpg"
+	else
+		"#{batch_name}#{pic_number}.jpg"
+	end
+	
+	if File.exist?(new_name)
+		puts 'File name conflict. Aborting renaming process.'
+		exit
+	else
+		File.rename name, new_name
+		pic_number = pic_number + 1
+	end
+end
+    puts
+    puts 'Done and dusted!'
\ No newline at end of file
diff --git a/ch12-new-classes-of-objects/happy_birthday.rb b/ch12-new-classes-of-objects/happy_birthday.rb
index 801de24bd..d26f70b04 100644
--- a/ch12-new-classes-of-objects/happy_birthday.rb
+++ b/ch12-new-classes-of-objects/happy_birthday.rb
@@ -1 +1,18 @@
-# your code here
\ No newline at end of file
+puts 'What year were you born?'
+b_year = gets.chomp.to_i
+
+puts 'What month were you born? (1-12)'
+b_month = gets.chomp.to_i
+
+puts 'What day of the month were you born?'
+b_day = gets.chomp.to_i
+
+b = Time.local(b_year, b_month, b_day)
+t = Time.new
+
+age = 1
+
+while Time.local(b_year + age, b_month, b_day) <= t
+  puts 'SPANK!'
+  age = age + 1
+end
\ No newline at end of file
diff --git a/ch12-new-classes-of-objects/one_billion_seconds.rb b/ch12-new-classes-of-objects/one_billion_seconds.rb
index 801de24bd..1afda2a53 100644
--- a/ch12-new-classes-of-objects/one_billion_seconds.rb
+++ b/ch12-new-classes-of-objects/one_billion_seconds.rb
@@ -1 +1 @@
-# your code here
\ No newline at end of file
+puts(Time.gm(1993, 6, 4, 10, 31) + 10**9)
\ No newline at end of file
diff --git a/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb b/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
index 037b6cb09..565729272 100644
--- a/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
+++ b/ch12-new-classes-of-objects/party_like_its_roman_to_integer_mcmxcix.rb
@@ -1,3 +1,30 @@
-def roman_to_integer roman
-  # your code here
+def roman_to_integer(roman)
+   
+   roman = roman.upcase
+ 
+   return 0 if roman == "NULLA"
+   numerals = { M: 1000,
+                D: 500,
+                C: 100,
+                L: 50,
+                X: 10,
+                V: 5,
+                I: 1 }
+                
+number = 0
+previous_value = 0
+ 
+i = roman.length - 1
+    while i >= 0
+    value = numerals[roman[i].to_sym]
+     return "Not a valid roman numeral" if value.nil?
+       if value >= previous_value
+       number += value
+       else
+       number -= value
+       end
+     previous_value = value
+     i -= 1
+    end
+    number
 end
\ No newline at end of file
diff --git a/ch13-creating-new-classes/extend_built_in_classes.rb b/ch13-creating-new-classes/extend_built_in_classes.rb
index c3e793933..b26f4f140 100644
--- a/ch13-creating-new-classes/extend_built_in_classes.rb
+++ b/ch13-creating-new-classes/extend_built_in_classes.rb
@@ -1,3 +1,27 @@
 class Integer
-  # your code here
+  
+  def factorial
+    
+    raise 'Must not use negative integer' if self < 0
+    
+    (self <= 1) ? 1 : self * (self-1).factorial
+  end
+  
+  
+  def to_roman
+    
+    raise 'Must use positive integer' if self <= 0
+   
+    roman = ''
+   
+    roman << 'M' * (self / 1000)
+    roman << 'D' * (self % 1000 / 500)
+    roman << 'C' * (self % 500 / 100)
+    roman << 'L' * (self % 100 / 50)
+    roman << 'X' * (self % 50 / 10)
+    roman << 'V' * (self % 10 / 5)
+    roman << 'I' * (self % 5 / 1)
+    
+    roman
+  end
 end
\ No newline at end of file
diff --git a/ch13-creating-new-classes/interactive_baby_dragon.rb b/ch13-creating-new-classes/interactive_baby_dragon.rb
index 801de24bd..6524ce810 100644
--- a/ch13-creating-new-classes/interactive_baby_dragon.rb
+++ b/ch13-creating-new-classes/interactive_baby_dragon.rb
@@ -1 +1,20 @@
-# your code here
\ No newline at end of file
+puts 'What would you like to name your baby dragon?'
+name = gets.chomp
+pet = Dragon.new name
+obj = Object.new
+
+while true
+
+  puts
+  puts 'commands: feed, toss, walk, rock, put_to_bed, exit'
+  command = gets.chomp
+
+  if command == 'exit'
+    exit
+  elsif pet.respond_to?(command) && !obj.respond_to?(command)
+    pet.send command
+  else
+    puts 'This dragon isn\'t fully trained yet! Please choose a command.'
+  end
+
+end
\ No newline at end of file
diff --git a/ch13-creating-new-classes/orange_tree.rb b/ch13-creating-new-classes/orange_tree.rb
index 025d08907..e39c8e13e 100644
--- a/ch13-creating-new-classes/orange_tree.rb
+++ b/ch13-creating-new-classes/orange_tree.rb
@@ -1,11 +1,49 @@
-# in order to pass the rspec please follow the below rates of growth, orange production and age of death.
-# have your OrangeTree grow by 0.4 per year.
-# have it produce no oranges in its first 5 years
-# starting in its sixth year have it produce oranges at a rate of (height * 15 - 25) per year.
-# have the tree die after 25 years.
-# check out the rspec spec/ch13/orange_tree_spec.rb to see what strings we're looking for in the responses.
-
-
 class OrangeTree
-  # your code here
-end
+  def initialize
+     @age = 0
+     @height = 0
+     @orange_count = 0
+     @alive = true
+  end
+ 
+   def height
+     @alive ? @height : "A dead tree is not very tall. :("
+   end
+ 
+   def count_the_oranges
+     @alive ? @orange_count : "A dead tree has no oranges. :("
+   end
+ 
+   def pick_an_orange
+     if @alive
+       if @orange_count > 0
+         @orange_count -= 1
+         "Delicious!"
+       else
+         "There are no oranges on the tree this year"
+       end
+     else
+       "A dead tree has nothing to pick. :("
+     end
+   end
+ 
+   def one_year_passes
+     @orange_count = 0
+     @age += 1
+     @height = (@height + 0.4).round(1)
+     if @alive
+ 
+       if @age > 25
+         @alive = false
+         "Oh, no! The tree is too old, and has died. :("
+       elsif @age > 5
+         @orange_count += (@height * 15 - 25).round
+         "This year your tree grew to #{@height}m tall, and produced #{@orange_count} oranges."
+       end
+ 
+     else
+       "A year later, the tree is still dead. :("
+     end
+   end
+ 
+end
\ No newline at end of file
diff --git a/ch14-blocks-and-procs/better_program_logger.rb b/ch14-blocks-and-procs/better_program_logger.rb
index 0e2e18d57..7d0c9cc42 100644
--- a/ch14-blocks-and-procs/better_program_logger.rb
+++ b/ch14-blocks-and-procs/better_program_logger.rb
@@ -1,3 +1,10 @@
-def log desc, &block
-  # your code here
+$nesting_depth = 0
+
+def better_log desc, &block
+  indent = " " * $nesting_depth
+  puts "#{indent}Beginning \"#{desc}\"..."
+  $nesting_depth += 1
+  result = block.call
+  puts "#{indent}...\"#{desc}\" finished, returning: #{result}"
+  $nesting_depth -= 1
 end
\ No newline at end of file
diff --git a/ch14-blocks-and-procs/even_better_profiling.rb b/ch14-blocks-and-procs/even_better_profiling.rb
index b01b78fd8..676550da4 100644
--- a/ch14-blocks-and-procs/even_better_profiling.rb
+++ b/ch14-blocks-and-procs/even_better_profiling.rb
@@ -1,3 +1,12 @@
+$OPT_PROFILING_ON = false
+
 def profile block_description, &block
-  # your code here
+  if $OPT_PROFILING_ON
+    start_time = Time.new
+    block[]
+    duration = Time.new - start_time
+    puts "#{block_description}: #{duration} seconds"
+  else
+    block[]
+  end
 end
\ No newline at end of file
diff --git a/ch14-blocks-and-procs/grandfather_clock.rb b/ch14-blocks-and-procs/grandfather_clock.rb
index 916f6d354..c423edf20 100644
--- a/ch14-blocks-and-procs/grandfather_clock.rb
+++ b/ch14-blocks-and-procs/grandfather_clock.rb
@@ -1,3 +1,7 @@
 def grandfather_clock &block
-  # your code here
-end
\ No newline at end of file
+  hour = (Time.new.hour + 11)%12 + 1
+
+  hour.times(&block)
+end
+
+grandfather_clock { puts 'DONG!' }
\ No newline at end of file
diff --git a/ch14-blocks-and-procs/program_logger.rb b/ch14-blocks-and-procs/program_logger.rb
index 0e2e18d57..05c840f0b 100644
--- a/ch14-blocks-and-procs/program_logger.rb
+++ b/ch14-blocks-and-procs/program_logger.rb
@@ -1,3 +1,17 @@
-def log desc, &block
-  # your code here
+def program_log desc, &block
+  puts "Beginning #{desc.inspect}..."
+  result = block[]
+  puts "...#{desc.inspect} finished, returning: #{result}"
+end
+
+program_log 'outer block' do
+  program_log 'some little block' do
+    1**1 + 2**2
+  end
+
+  program_log 'yet another block' do
+    '!doof iahT ekil I'.reverse
+  end
+  
+  '0' == 0
 end
\ No newline at end of file