Apocalypse is an action game starring Bruce Willis and was Neversoft's first game before creating the Tony Hawk's Pro Skater series. In fact, this game's engine was used to experiment with the concept, with Bruce Willis skateboarding all over the place. It was also later used in Neversoft's Spider-Man game.
Pause the game, hold L1, and press Square, Circle, X for the area select and Triangle, Up, X, Down for the stage select.
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Specifically: Find a way to access the "temp" area.
Activating the Stage Select also brings up a build date on the title screen and lets you access an autotest feature, which cycles through all the levels and areas. One of the areas from Stage 2 is simply labeled as "temp".
Pause the game, hold L1, and press Triangle, Up, X, Down.