In 2003 Kojima produced and designed Boktai (Game Boy Advance), whose…

“I actually had wanted to include a sensor that measured how your breath smelled too! I *really* wanted to add that! The enemies are vampires, right? So if you ate something garlic-y and breathed on the mic, they'd all die. (laughs) [...] "Guys, we have to do this!!" But the rest of the staff all hated the idea.”

“You can't ultimately win against that void of nothingness that is space—victory's just not in the cards. And yet still he fights. I think this is actually a pattern that re-appears in all my games, the concept of a battle that's a lost cause. (laughs)”

After entering the video game industry and moving to Okamoto to live alone, Kojima brought only his bed, stereo, and bicycle from home; he did not yet have a TV or air conditioning, ate all his meals outside, and on hot, lonely nights took walks to bookstores that stayed open late. In one of those stores he discovered Yukinobu Hoshino’s 2001 Nights; its art and mature science-fiction content rekindled his passion for the genre and led him to hunt through used bookstores and otaku shops for all of Hoshino’s work.

“this is exactly the kind of thing I have always wanted to create. Not a game merely played to "pass the time", but something that would be important to one's own life experience.”

Besides Metal Gear, at Konami Kojima produced or supervised other games: he was producer of Zone of the Enders (2001) and of Boktai (2003), executive producer of Castlevania: Lords of Shadow (2010) and supervising director of Metal Gear Rising: Revengeance (2013).