The World of Spending

 is the second level in the game, still taking place in the mall. Completing it unlocks Montezuma.

Collect all five hidden scrolls

 * In the clothes shop right next to where you start the level.
 * On the far southern (bottom edge of the screen) end of the gallery, where you find the zombie with the key to the detonators.
 * Near the switches which turn on the shower to douse the flames (near a Grindhouse cafe).
 * Defeat the Death Valley Girl.
 * Defeat the Death Valley Girl.

Complete the level in six minutes or less
Self-explanatory. Dodge and dash your way through hordes, kill only whom you must, and exterminate the boss as fast as you can.d

Don't step in any doggy doo!

 * Reward: Bathory's Tub

During the fight with the Death Valley Girl, avoid stepping in any piles of excrement left behind by her dogs. It's easy to do with a ranged character, just pay attention to where you're running through.

Complete the entire level without any characters dying

 * Reward: Holy Grill

Self-explanatory.

Complete the level in seven minutes or less
Self-explanatory.