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• Xevious
• Battle City
• Star Luster
As explained by the development team in an issue of Nintendo Dream, this was done to highlight Star Fox: Assault being a collaboration between Nintendo and Namco, with the latter being its primary developer. With the Star Fox franchise being a sci-fi shooter series, Tsuyoshi Kobayashi and Takaya Imamura had carefully decided on which classic Namco games would fit the best with that vibe. There were considerations to also include Nintendo created Famicom/NES games (one person, for example, had suggested including Balloon Fight), but ultimately Imamura and Kobayashi couldn't come up with any games that would have fit the Star Fox world and atmosphere.
Unfortunately, as the Famicom versions of Battle City and Star Luster had never been released in Western territories, they in turn were excluded from all Western versions of Star Fox: Assault, leaving Xevious as the only unlockable Namco game outside of Japan.
Star Fox Assault Nintendo Dream interview:
https://shmuplations.com/starfoxassault/
Footage of Xevious, the only unlockable Namco game in the western version of SFAss:
https://youtu.be/BrMv7tKA74A?t=6
https://shmuplations.com/starfoxassault/
Footage of Xevious, the only unlockable Namco game in the western version of SFAss:
https://youtu.be/BrMv7tKA74A?t=6
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In the 2/86 interview with the game's designer Masanobu Endō published in the issue of Famimaga magazine, he commented that one of the team's employees named Akira was nicknamed "Bakira", because he had a tendency to break things. This in-joke is likely a play on the kanji "爆" (baku), to explode/burst/roar. Endō then admitted he used his nickname as an inspiration for the enemies as "Bacura" enemies in Xevious, commenting:
"...my generation, the "Gundam Generation", we love to make up stupid reasons for every choice we make. Even if it's a lie. (laughs)"
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In a 2003 interview with the game's creator, Masanobu Endoh, Xevious was originally meant to take place during the Vietnam war, and the Solvalou was to be a helicopter.
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