Coins = The main currency in the game to buy most shop items. You earn coins primarily by completing missions, harvesting crops, leveling-up and killing zombies.
Cash = Cash is the primary way to hurry through certain parts of the game and early un-lock special weapons, decorations and character accessories and clothing.
Energy = Energy allows characters to perform various actions throughout the game. Depleted energy re-fills automatically over time, when a character levels up, or by purchasing energy packs from the shop. Progressing through levels gives characters a higher energy threshold.
Bricks = Bricks enable the creation of new buildings and are acquired by clearing broken pavement and rubble
Food = Purchase energy packs with food. Acquire food by performing farming tasks.
Collection items = Killing zombies generates collection items, which allow you to craft new weapons in your buildings.