The Hardy Boys (original series) (1927–1979)
_x_ 1. The Tower Treasure
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2. The House on the Cliff
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3. The Secret of the Old Mill
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4. The Missing Chums
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5. Hunting for Hidden Gold
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6. The Shore Road Mystery
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7. The Secret of the Caves
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8. The Mystery of Cabin Island
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9. The Great Airport Mystery
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10. What Happened at Midnight
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11. While the Clock Ticked
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12. Footprints under the Window
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13. The Mark on the Door
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14. The Hidden Harbor Mystery
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15. The Sinister Sign Post
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16. A Figure in Hiding
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17. The Secret Warning
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18. The Twisted Claw
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19. The Disappearing Floor
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20. Mystery of the Flying Express
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21. The Clue of the Broken Blade
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22. The Flickering Torch Mystery
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23. The Melted Coins
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24. The Short-Wave Mystery
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25. The Secret Panel
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26. The Phantom Freighter
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27. The Secret of Skull Mountain
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28. The Sign of the Crooked Arrow
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29. The Secret of the Lost Tunnel
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30. The Wailing Siren Mystery
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31. The Secret of Wildcat Swamp
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32. The Crisscross Shadow
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33. The Yellow Feather Mystery
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34. The Hooded Hawk Mystery
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35. The Clue in the Embers
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36. The Secret of Pirates' Hill
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37. The Ghost at Skeleton Rock
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38. Mystery at Devil's Paw
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39. The Mystery of the Chinese Junk
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40. Mystery of the Desert Giant
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41. The Clue of the Screeching Owl
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42. The Viking Symbol Mystery
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43. The Mystery of the Aztec Warrior
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44. The Haunted Fort
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45. The Mystery of the Spiral Bridge
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46. The Secret Agent on Flight 101
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47. Mystery of the Whale Tattoo
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48. The Arctic Patrol Mystery
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49. The Bombay Boomerang
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50. Danger on Vampire Trail
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51. The Masked Monkey
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52. The Shattered Helmet
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53. The Clue of the Hissing Serpent
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54. The Mysterious Caravan
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55. The Witchmaster's Key
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56. The Jungle Pyramid
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57. The Firebird Rocket
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58. The Sting of the Scorpion
The Hardy Boys ("digests") (1979–2005)
_x_ 59. Night of the Werewolf
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60. Mystery of the Samurai Sword
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61. The Pentagon Spy
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62. The Apeman's Secret
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63. The Mummy Case
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64. Mystery of Smugglers Cove
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65. The Stone Idol
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66. The Vanishing Thieves
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67. The Outlaw's Silver
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68. Submarine Caper / Deadly Chase
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69. The Four-Headed Dragon
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70. The Infinity Clue
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71. Track of the Zombie
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72. The Voodoo Plot
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73. The Billion Dollar Ransom
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74. Tic-Tac-Terror
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75. Trapped At Sea
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76. Game Plan for Disaster
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77. The Crimson Flame
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78. Cave-In!
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79. Sky Sabotage
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80. The Roaring River Mystery
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81. The Demon's Den
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82. The Blackwing Puzzle
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83. The Swamp Monster
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84. Revenge of the Desert Phantom
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85. The Skyfire Puzzle
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86. The Mystery of the Silver Star
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87. Program for Destruction
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88. Tricky Business
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89. The Sky Blue Frame
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90. Danger on the Diamond
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91. Shield Of Fear
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92. The Shadow Killers
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93. The Serpent's Tooth Mystery
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94. Breakdown in Axeblade
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95. Danger on the Air
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96. Wipeout
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97. Cast of Criminals
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98. Spark of Suspicion
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99. Dungeon of Doom
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100. The Secret of the Island Treasure
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101. The Money Hunt
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102. Terminal Shock
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103. The Million-Dollar Nightmare
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104. Tricks of the Trade
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105. The Smoke Screen Mystery
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106. Attack of the Video Villains
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107. Panic on Gull Island
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108. Fear on Wheels
___ 109. The Prime-Time Crime
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110. The Secret of Sigma Seven
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111. Three-Ring Terror
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112. The Demolition Mission
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113. Radical Moves
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114. The Case of the Counterfeit Criminals
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115. Sabotage at Sports City
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116. Rock 'N' Roll Renegades
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117. The Baseball Card Conspiracy
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118. Danger in the Fourth Dimension
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119. Trouble at Coyote Canyon
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120. The Case of the Cosmic Kidnapping
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121. The Mystery in the Old Mine
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122. Carnival of Crime
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123. The Robot's Revenge
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124. Mystery With a Dangerous Beat
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125. Mystery on Makatunk Island
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126. Racing to Disaster
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127. Reel Thrills
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128. Day of the Dinosaur
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129. The Treasure at Dolphin Bay
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130. Sidetracked to Danger
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131. Crusade of the Flaming Sword
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132. Maximum Challenge
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133. Crime in the Kennel
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134. Cross-Country Crime
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135. The Hypersonic Secret
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136. The Cold Cash Caper
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137. High-Speed Showdown
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138. The Alaskan Adventure
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139. The Search for the Snow Leopard
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140. Slam Dunk Sabotage
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141. The Desert Thieves
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142. Lost in Gator Swamp
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143. The Giant Rat of Sumatra
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144. The Secret of Skeleton Reef
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145. Terror at High Tide
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146. The Mark of the Blue Tattoo
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147. Trial and Terror
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148. The Ice-Cold Case
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149. The Chase for the Mystery Twister
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150. The Crisscross Crime
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151. The Rocky Road to Revenge
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152. Danger in the Extreme
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153. Eye On Crime
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154. The Caribbean Cruise Caper
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155. The Hunt for the Four Brothers
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156. A Will To Survive
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157. The Lure of the Italian Treasure
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158. The London Deception
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159. Daredevils
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160. A Game Called Chaos
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161. Training for Trouble
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162. The End of the Trail
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163. The Spy That Never Lies
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164. Skin & Bones
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165. Crime in the Cards
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166. Past and Present Danger
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167. Trouble Times Two
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168. The Castle Conundrum
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169. Ghost of a Chance
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170. Kickoff To Danger
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171. The Test Case
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172. Trouble in Warp Space
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173. Speed Times Five
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174. Hide and Sneak
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175. Trick-or-Trouble
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176. In Plane Sight
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177. The Case of the Psychic's Vision
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178. The Mystery of the Black Rhino
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179. Passport to Danger
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180. Typhoon Island
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181. Double Jeopardy
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182. The Secret of the Soldier's Gold
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183. Warehouse Rumble
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184. The Dangerous Transmission
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185. Wreck and Roll
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186. Hidden Mountain
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187. No Way Out
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188. Farming Fear
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189. One False Step
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190. Motocross Madness
The Hardy Boys Casefiles (1987–1998)
1. Dead on Target
2. Evil, Inc.
3. Cult of Crime
4. The Lazarus Plot
5. Edge of Destruction
6. The Crowning Terror
7. Deathgame
8. See No Evil
9. The Genius Thieves
10. Hostages of Hate
11. Brother against Brother
12. Perfect Getaway
13. The Borgia Dagger
14. Too Many Traitors
15. Blood Relations
16. Line of Fire
17. The Number File
18. A Killing in the Market
19. Nightmare in Angel City
20. Witness to Murder
21. Street Spies
22. Double Exposure
23. Disaster for Hire
24. Scene of the Crime
25. The Borderline Case
26. Trouble in the Pipeline
27. Nowhere to Run
28. Countdown to Terror
29. Thick as Thieves
30. The Deadliest Dare
31. Without a Trace
32. Blood Money
33. Collision Course
34. Final Cut
35. The Dead Season
36. Running on Empty
37. Danger Zone
38. Diplomatic Deceit
39. Flesh and Blood
40. Fright Wave
41. Highway Robbery
42. The Last Laugh
43. Strategic Moves
44. Castle Fear
45. In Self-Defense
46. Foul Play
47. Flight Into Danger
48. Rock 'n' Revenge
49. Dirty Deeds
50. Power Play
51. Choke Hold
52. Uncivil War
53. Web of Horror
54. Deep Trouble
55. Beyond the Law
56. Height of Danger
57. Terror on Track
58. Spiked!
59. Open Season
60. Deadfall
61. Grave Danger
62. Final Gambit
63. Cold Sweat
64. Endangered Species
65. No Mercy
66. The Phoenix Equation
67. Lethal Cargo
68. Rough Riding
69. Mayhem in Motion
70. Rigged for Revenge
71. Real Horror
72. Screamers
73. Bad Rap
74. Road Pirates
75. No Way Out
76. Tagged for Terror
77. Survival Run
78. The Pacific Conspiracy
79. Danger Unlimited
80. Dead of Night
81. Sheer Terror
82. Poisoned Paradise
83. Toxic Revenge
84. False Alarm
85. Winner Take All
86. Virtual Villainy
87. Dead Man in Deadwood
88. Inferno of Fear
89. Darkness Falls
90. Deadly Engagement
91. Hot Wheels
92. Sabotage at Sea
93. Mission: Mayhem
94. A Taste for Terror
95. Illegal Procedure
96. Against All Odds
97. Pure Evil
98. Murder by Magic
99. Frame-up
100. True Thriller
101. Peak Of Danger
102. Wrong Side of the Law
103. Campaign of Crime
104. Wild Wheels
105. Law of the Jungle
106. Shock Jock
107. Fast Break
108. Blown Away
109. Moment Of Truth
110. Bad Chemistry
111. Competitive Edge
112. Cliff-Hanger
113. Sky High
114. Clean Sweep
115. Cave Trap
116. Acting Up
117. Blood Sport
118. The Last Leap
119. The Emperor's Shield
120. Survival of the Fittest
121. Absolute Zero
122. River Rats
123. High Wire Act
124. The Viking's Revenge
125. Stress Point
126. Fire in the Sky
127. Dead in the Water
The Hardy Boys are: The Clues Brothers (1997–2000)
___ 1. The Gross Ghost Mystery
___ 2. The Karate Clue
___ 3. First Day, Worst Day
___ 4. Jump-Shot Detectives
___ 5. The Dinosaur Disaster
___ 6. Who Took the Book?
___ 7. The Abracadabra Case
___ 8. The Dog-Gone Detectives
___ 9. The Pumped-Up Pizza Problem
___ 10. The Walking Snowman
___ 11. The Monster in the Lake
___ 12. King for a Day
_x_ 13. Pirates Ahoy!
_x_ 14. All Eyes On First Prize
___ 15. Slip, Slide, and Slap Shot
_x_ 16. The Fish-Faced Mask Of Mystery
_x_ 17. The Bike Race Ruckus
The Hardy Boys: Undercover Brothers (2005-Date)
1. Extreme Danger
2. Running On Fumes
3. Boardwalk Bust
4. Thrill Ride
5. Rocky Road
6. Burned
7. Operation: Survival
8. Top Ten Ways to Die
9. Martial Law
10. Blown Away
11. Hurricane Joe
12. Trouble in Paradise
13. The Mummy's Curse
14. Hazed
15. Death And Diamonds
16. Bayport Buccaneers
17. Murder At The Mall
18. Pushed
19. Foul Play
20. Feeding Frenzy
21. Comic Con Artist
22. Deprivation House