Over the years, the Game Boy Advance has seen countless hidden gems, leading to byte-thirsty collectors and passionate fans who just can't get over their favorite games. The gaming directory the GBA offers, in addition to the advancements it made for its time, make it one of the most popular retro gaming consoles around.

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Whether a Pokemon enthusiast who has been catching 'em all for decades or a plumber who eats magical mushrooms on his way to rescue his princess, the GBA lets players become whoever they want with its enormous library. The cost of Game Boy Advance games has also seen an increase as more and more years have gone by, so the rarest GBA games will now cost collectors quite a bit.

10 Robopon 2 Cross Version ($429)

Released by Atlus in 2002 for the Game Boy Advance, Robopon 2: Cross Version allows players to fully immerse themselves in a delightful world that is filled with cute and customizable robotic beings called Robopon. At least it does for those who can afford it, anyway.

The game builds upon its predecessors quite successfully and does a great job of keeping the player engaged with humor and action. The charming graphics and the deep customization options all contribute to the value of the game, making it a great addition to any GBA collection.

9 Ice Nine ($450)

Developed by DreamFactory and published by Kemco in 2005, Ice Nine is a rather hidden gem in the library of GBA. It's clearly not that well hidden, though, at least not enough to stop the game from becoming one of the rarest and most expensive games for the Game Boy Advance.

In the game, the player controls Ethan, who embarks on a bloody quest to save his sister from a mysterious ice spell. The game doesn't just consist of shooting, but also utilizes cleverly designed puzzles, keeping the player engaged throughout the playthrough. Ice Nine is a worthwhile addition to any GBA collection for those who have an interest in underrated gems.

8 Pokemon Emerald ($454)

Despite having sold more than ten million copies, Pokemon Emerald is somehow among the most expensive Game Boy Advance games. Released by none other than Nintendo in 2005, the game takes players to the Hoenn region where they embark on their journey as a Pokemon trainer.

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Aside from improved graphics, new Pokemon, and the Battle Frontier feature, the game utilizes combined elements from Pokemon Ruby and Pokemon Sapphire that players loved. In the game, players will have to deal with Team Magma and Team Aqua, who are messing with the region's climate, while also exploring the world and catching 'em all.

7 Moto Racer Advance ($500)

Moto Racer Advance introduces the thrill of high-speed racing to the Game Boy Advance. Developed by Adeline Software International and published by Ubisoft in 2002, the game offers an experience that is sure to get the player's adrenaline pumping.

Players are free to choose from numerous motorcycles and dirt bikes to race through diverse tracks and environments that require both road racing and motocross skills. The impressive graphics and smooth gameplay made the game a big hit among players, and it has continued to hold its value over time, being among the rarest GBA games.

6 Little League Baseball 2002 ($500)

Developed by Now Production and published by Activision for the GBA in 2002, Little League Baseball 2002 features an engaging multiplayer mode that helped to set it apart from its peers. The game drew inspiration from the widely acknowledged Little League World Series and lets players create their own baseball team and manage it themselves.

With its colorful graphics, realistic gameplay, and impressive multiplayer mode, the game offers an immersive experience that undoubtedly pleases fans of the sport. This, and the fact that there weren't really any other top-tier baseball games for the system makes it an excellent addition to any GBA collection.

5 BattleBots: Beyond the Battlebox ($515)

Based on the popular TV show BattleBots, Battlebots: Beyond The Battlebox rings the legendary battles seen on TV to the handheld GBA. Developed by Cave Barn Studios and published by Majesco, it contains a variety of powerful robots for the player to choose from as they partake in great battles within the BattleBox Arena.

The strategic gameplay, level of customization, and authentic BattleBots experience make this game a great addition to any GBA collection and a perfect choice for fans of the series. It's also one of the rarest and most expensive games for the system though, with complete copies regularly selling for over five hundred bucks.

4 DemiKids: Dark Version ($554)

Released for the GBA by Atlus in 2003, DemiKids: Dark Version is an obvious spin-off of the Shin Megami Tensei series, taking place in a somewhat similar dark and intriguing world. In the game, the player takes control of the young demon tamer Jin, battling and recruiting demons as they please just like in SMT.

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The game offers a familiar, if not inferior to, SMT experience with the story, mechanics, and tactical battles almost identical. However, those who enjoyed SMT and are looking for a similar experience will probably enjoy what DemiKids: Dark Version has to offer.

3 Pocky & Rocky with Becky ($697)

Released in 2001 by Natsume for the Game Boy Advance, Pocky & Rocky with Becky is a delightful action-adventure game that is the third installment in its franchise. In this title, Becky the raccoon joins Pocky and Rocky on their quest.

The game allows players to choose from three characters and navigate through charming environments while trying to outlast enemies and bosses. The multiplayer mode, enhanced graphics, and engaging gameplay make it a true gem among its peers and a must-have title for any serious GBA collector.

2 Sega Rally Championship ($937)

Another motor sports game, Sega Rally Championship was released for the GBA by Sega in 2002. In this handheld version of the popular arcade title, players can choose from a wide array of vehicles to race across roads of dirt, snow, and asphalt.

Boasting responsive controls and dynamic graphics, the game offers an immersive arcade-style rally racing experience. With its fast-paced gameplay and challenging courses, it provides a nostalgic experience for both Sega fans and those who like motorsports.

1 Ninja Five-O Game Boy Advance ($1,077)

Developed by Hudson Soft and released in 2003 for the GBA, Ninja Five-O is an action platformer to remember. This 2D side-scrolling ninja game follows the story of Joe Osugi, who is a skilled Ninja-Cop, on a mission to save hostages and destroy an evil terrorist organization.

The limited marketing and distribution coupled with a rise in popularity since the game's release have made it rise in price like no other GBA game. Fans of the genre and collectors who want to have one of the rarest GBA games are more than welcome to try this hidden gem, though adding it to their collection will likely cost them over a thousand dollars.

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