Extremely valuable Nintendo games hiding in your closet

If you're like most people, you probably still have some of your favorite childhood Nintendo games stashed away in a box somewhere. If you're willing to part with them, you could earn some cold hard cash—for the right titles, of course. Now, we're not going to discuss the rarest of the rare here—we know you probably don't have a copy of the original Stadium Events hidden in your attic. But these games are still rare enough that they can net you a decent amount of money—if you can bear to let them go.

[A quick note about terminology: a "loose cartridge" or "disc only" is exactly what it sounds like—just the game cartridge or disc, with no other accessories. A "complete in box" game or "CIB" generally includes the game, manual, and original box. We've included current prices for both options for your reference.]

Bonk's Adventure (NES, 1994)

Originally released for the doomed TurboGrafx-16 console, the Bonk's Adventure developers ported this quirky 2D platform game to the NES. In the game, you control Bonk, a cave boy who battles dinosaurs and other prehistoric enemies by literally head-butting them to death. If you've got a copy of Bonk's Adventure hiding in your collection, it's worth quite a few bones—about $400 for the cartridge only, and $1400 for a CIB.

Bubble Bobble Part 2 (NES, 1993)

The second installment in the successful arcade platformer game series, Bubble Bobble Part 2 sees the return of brothers Bub and Bob, a pair of Bubble Dragons who must make their way through increasingly difficult stages in order to save their friend Judy. The gameplay is similar to all the other Bubble Bobble games, although the NES version also includes bonus stages. At the time of this writing, a Bubble Bobble Part 2 cartridge is worth approximately $300, and about $1000 if it's complete-in-box

Panic Restaurant (NES, 1992)

Panic Restaurant features Chef Cookie wielding a frying pan to battle his way through six platform levels filled with food monsters before reaching a final showdown with his arch-rival, evil chef Ohdove—an awesomely horrible transliteration of "Hors d'Oeuvre." If you've got a copy of Panic Restaurant, it's worth around $540 for a loose cartridge, and $675 if it's CIB.

Aero Fighters (SNES, 1993)

Choose from different planes and fighter pilot characters in Aero Fighters, a vertical-scrolling arcade shooter ported to the Super Nintendo in 1993. It's currently considered to be one of the rarest titles ever released for Super NES, and comes in at $559 for the cartridge alone, and about $900 for one that's complete in the box.

Hagane: The Final Conflict (SNES, 1994)

Hagane: The Final Conflict is a side-scrolling action platformer in which you play as Hagane, a cyborg ninja on a quest for the ultimate revenge on the rival Koma clan. With a futuristic setting, challenging stages, and advanced controls, Hagane has become a cult classic over the years and is in high demand. Currently, you could get around $475 for a loose cartridge, and a whopping $1250 for a CIB version.

Metal Warriors (SNES, 1995)

Do battle while piloting a mech assault suit in the game Metal Warriors. Set in a dystopian future where the remaining "Metal Warriors" defend the earth from the evil Dark Axis forces, it's a pretty standard entry in the side-scrolling action platformer genre. If you've got a copy of this game, it can fetch you about $200 for just the cartridge, and $430 for a cartridge complete in the box.

Worms: Armageddon (N64, 1999)

Worms: Armageddon is a turn-based military strategy game in which you control a team of worms while facing off against other teams. You can upgrade and gain new weapons as you advance, including the "Holy Hand Grenade" from the film Monty Python and the Holy Grail. Currently, the game is worth approximately $200 for a loose cartridge, and $450 for a cartridge that's CIB.

Bomberman 64: The Second Attack (N64, 1999)

In this sequel to 1997's Bomberman 64, you control Bomberman on an action adventure to save the world from possessed knights, demons, and even a goddess. While the game does not have graphics on par with some of the other N64 titles of its era, Bomberman 64: The Second Attack does give a good backstory to one of our favorite game characters. You can sell a cartridge of this game for about $150, and a complete-in-box version for $500.

Conker's Bad Fur Day (N64, 2001)

Even though it was released towards the end of the N64's lifespan, Conker's Bad Fur Day remains a favorite among classic gaming fans due to its unique gameplay and visual appeal. Guide Conker the Squirrel through myriad puzzles, levels and other challenges on his quest to return home. There's also a great multi-player mode where you can take on friends in mini-games. While not as rare as some of the other games we've discussed, if you've got a copy of Bad Fur Day, it's worth around $80 for a loose cartridge, and $130 complete in the box.

Cubivore: Survival of the Fittest (Gamecube, 2002)

Cubivore is an action-adventure title where you must guide your cube-shaped avatar through the world and make it stronger by attacking and eating other Cubivores, thereby absorbing some of their power. When you've grown strong enough, you can take on the big boss, Killer Cubivore. Cubivore can net you about $130 for the disc only, and $240 if it's complete.

Fire Emblem: Path of Radiance (Gamecube, 2005)

The ninth installment in the Fire Emblem series, Path of Radiance is a role-playing game in which you must tactically place your group of up to 19 characters in order to defeat enemies in battle. Characters can be leveled up and skills customized (to an extent) to help you on your quest to defeat your enemy, Ashnard. If you have a copy of Fire Emblem: Path of Radiance, it's worth approximately $90 for the disc only, and $110 for a CIB version.

Castlevania Legends (GameBoy, 1997)

In Castlevania Legends, we follow the story of Sonia Belmont in 15th-Century Transylvania, as she battles through multiple platform stages on her journey to confront and defeat Dracula. Although the game was later removed from the Castlevania series' canon, and it was panned for lackluster music compared to the other Castlevania games, it remains a favorite among fans of the original Game Boy. A loose cartridge is worth about $60, and if you've got one in the box, it's worth $230.

Shantae (GameBoy Color, 2002)

The first in the Shantae series of platform video games, you guide "half-genie" Shantae on her adventures, ending with a confrontation with the dastardly female pirate, Risky Boots. The series has been wildly popular through the years, with a fourth installment in the series to be released in late 2016. If you're lucky enough to own a copy of Shantae, you could sell the cartridge for $290, and a CIB version for $550.

Ninja Five-O (GameBoy Advance, 2003)

Probably the most obscure game on our list, in Ninja Five-O you play as detective Joe Asugi who uses his alter-ego "Ninja Five-O" in order to battle what is essentially the Crazy 88 from Kill Bill. Currently, this game is worth about $100 for the cartridge alone, and $350 for a complete in box game.