Development
Production of Crash Bandicoot 2: Cortex Strikes Back began in October 1996. For the game, Crash Bandicoot co-creator Andy Gavin programmed a new engine named "Game Oriented Object LISP 2" (GOOL 2) that was three times faster than the previous game's engine, could handle ten times the animation frames and twice the polygon count.
The concept art for the game's environments was mainly created by Naughty Dog employees Bob Rafei, Eric Iwasaki, Erick Pangilinan, Charlotte Francis and Jason Rubin. The jungle levels were originally to have featured ground fog, but this was abandoned when magazines and the public began to criticize other developers for using fog to hide polygon count. Sunlight and depth accentuation was experimented with for these levels. Naughty Dog created the sewer levels as a way to work some "dirty" locations in the game. Color contrast was added to the levels to show depth and break up the repetitive monotony of the endless sewer pipes. A flat plane z-buffer was created for the game; because the water surfaces and mud in the jungle had to be a flat plane and be exactly flat on the Y-axis, there could be no waves and the subdividing plane could not be at an odd angle. The effect only worked on objects in the foreground and was only used on Crash, some enemies and a few boxes at the same time.
The soundtrack of Crash Bandicoot 2: Cortex Strikes Back was provided by Mutato Muzika (consisting of Mark Mothersbaugh and Josh Mancell), while the sound effects were created by Universal Sound Studios (consisting of Mike Gollom, Ron Horwitz and Kevin Spears). The characters were designed by Charles Zembillas of American Exitus, Incorporated. Clancy Brown provided the voice of Doctor Neo Cortex, while Brendan O'Brien voiced the dual role of Doctor N. Gin and Doctor Nitrus Brio and Vicki Winters voiced Coco Bandicoot. The game was unveiled at the Electronic Entertainment Expo in Atlanta, Georgia on June 1997 to a positive response from the game industry. The game went into the alpha stage on August 1997. Around that time, Dan Arey, the lead designer of Gex: Enter the Gecko, joined Naughty Dog and streamlined the level design. A death animation in which Crash is squashed into a stunned head and feet was altered for the Japanese version of the game due to its resemblance to the severed head and shoes left by a serial killer loose in Japan at the time.
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