Cubic Ninja

 is a puzzle video game for the Nintendo 3DS. Developed by AQ Interactive and published by Ubisoft, the game requires players to use the console's accelerometer and gyroscope to manipulate the titular character through various levels on a quest to rescue a princess.
The game was released to mixed reviews; although praised for its unique gameplay concept, critics panned aspects of the game's control scheme, along with its "frustrating" wired level designs and relatively short length. Despite its poor reception, "Cubic Ninja" received renewed notoriety in November 2014, after it was revealed that an exploit in the game's level editor would allow the 3DS to execute homebrew code.
Gameplay.
"Cubic Ninja" is a puzzle-based platforming game, in which the player manipulates CC, a ninja cube, through various levels, whilst avoiding enemies and traps contained within. The game is controlled primarily using the 3DS's gyroscope, requiring the player to tilt the console in the direction they want CC to move. The game can also be set to use the circle pad instead. Using power-ups collected from scrolls, CC can shrink, gain a shield, throw shuriken at enemies, and unlock all of the doors in a level. The game contains 100 levels, including several boss battles. Players can unlock different characters, such as cubes made of rubber and titanium, that exhibit different properties when used. "Cubic Ninja" also features survival and time trial modes, along with a level editor; levels can be shared with others via QR codes.
Reception.
"Cubic Ninja" received mixed reviews from critics; both GameSpot and IGN gave the game a 5.5 out of 10. Describing "Cubic Ninja" as "one of those frustrating games that is almost really cool, but never quite delivers", IGN praised "Cubic Ninja" for its "fun and creative" gameplay, but the gyroscope controls were criticized for not being sensitive enough, while the circle pad control scheme was considered "wonky". Additionally, "Cubic Ninja" was panned for not containing enough content to justify being a full-price game, considering it to be "an experience that feels like it just as easily could have been a $5 iPhone game".
GameSpot shared similar criticism, noting that whilst providing "undeniable joy in winding your way through a particularly nasty stretch unscathed", the level designs of "Cubic Ninja"—especially on harder levels and boss fights, combined with its "carefree" controls, relied too heavily on unforeseen threats and were too frustrating. The presence of multiple characters and a level editor were praised for adding additional replay value to the game. "Pocket Gamer" was similarly critical of the game's level design, which made the game "very awkward indeed and completely counterintuitive"; most of the game's power-ups were also criticized for being "pointless". However, the overall visual appearance of "Cubic Ninja" was praised for "[feeling] like a great deal of care and attention was put into making the game look as slick as possible."
It was also noted that, ironically for a 3DS game, "Cubic Ninja" primarily used 2D graphics, although it was felt that the rotation-based gameplay would not have interacted well with the device's autostereoscopic display.
3DS homebrew exploit.
On November 17, 2014, "Cubic Ninja" became the subject of notoriety when Jordan "Smealum" Rabet publicized that a user mode exploit in the game would allow all existing 3DS models (including the 2DS and the New Nintendo 3DS) to execute homebrew code. The exploit, known as Ninjhax, requires users to place a boot file on the device's SD card, and then use the level sharing feature of "Cubic Ninja" to scan a malformed QR code. The code in question is a buffer overflow which triggers the download and execution of a launcher program, which can then be used to run applications. The data from the exploit is stored within the game's save data.
While Ninjhax was originally to be released on August 30, 2014, Rabet held off its release due to the unveiling of the New Nintendo 3DS, believing that any release before then would give Nintendo time to address the exploit on the new revision. The exploit was ultimately released on November 21, 2014 to coincide with the release of the New 3DS in Australia and New Zealand. Owing to his stance, Rabet noted that the exploit does not enable the use of unlicensed games, but did note that it could possibly be used to bypass the console's region lock.
The discovery—which is the first ever public software-based homebrew exploit for the 3DS family—triggered a surge in demand for the game, whose poor reception had led to its classification as a "bargain bin" title by critics. Copies of "Cubic Ninja" quickly sold out at a number of major video game retailers, while copies of the game from online retailers began increasing in price, ranging from US$25, to its original MSRP of $40 to as high as $500. Shortly after the announcement, Nintendo pulled "Cubic Ninja" from eShop, presumably in an effort to prevent widespread use of the exploit—the game was only available digitally in Japan, however. Rabet also pointed out that, ironically, despite the increased attention the game received, the studio who developed "Cubic Ninja" became defunct only months after its release through a merger that formed Marvelous AQL.
Subsequently, other people used Ninjhax as a base to develop further exploits that allowed running custom firmware and decryption of system contents and game cartridges. The popular flashcards Gateway 3DS now supports Cubic Ninja as an entry point through an exploit similar to Ninjhax.
On July 17, 2015 Ninjhax 2.0 was made available, which is compatible with 3DS firmware versions more recent than 9.2. This new revision became the second homebrew exploit that did not require the use of the 3DS system's web browser, the first being the savegame exploit found in "" nicknamed "OoT3Dhax". This new version of Ninjhax allows users with system versions 9.0 to 11.5. However, *hax 2.0 and all of its derivatives cannot run on all the firmware versions that Ninjhax 1.0 and its derivatives could, due to how it gains different privileges than ninjhax 1.0. 
On May 9, 2016, Nintendo released system update 11.0 that patched lots of homebrew exploits including a patch for Ninjhax that revoked access of "Cubic Ninja" to web services. On September 18, 2016, Ninjhax was updated to no longer require web services, requiring multiple QR codes to be scanned instead.