While exploring the locations, you will find different resources and expendables to help you in your playthrough. Those are:

Coins are your main currency in the Trade Mode and events. Use it to hire new workers, upgrade buildings, and buy boosters. The more you upgrade your shop, the more gold coins you will receive.

Gems are a rare, special currency used to buy items from the store.
Gems can be used to buy:
- Boosters - they can help you get more income;
- Upgrades in the safe (Speed booster, Bedtime, Scavengers Luck) - they will help you to increase offline earnings, ad boost multipliers, etc.);
- Chests in the store which contain gear;
- Tickets.

Diamonds are used instead of real money to make purchases.

Shovels are specific game items that help you loot items that help you fight zombies. When you loot items, you can find different items useful for fights. 

Tier Coins are used to upgrade your Shovel Handle to find Skins of higher tiers.

Brave Coins are used to upgrade your Shovel Blade level to loot gear of higher tiers.

Barn Keys are used to enter Pet Runs in Missions.

Graveyard Keys are used to enter the Endless Graveyard in Missions.

Metro Keys are used to enter the Profit Hunt in Missions.

Library Keys are used to enter the Library Run in Missions.

Arena Keys are used to fight other players on the Arena.

Tactical Tickets are used to get new Tactical Gear and upgrade it.

Pet Tickets are used to unlock new Pets and improve them.

Teeth and Golden Teeth are a special Arena currency used in the Arena Shop.

Marbles of various rarity are used to obtain chests of corresponding tiers in the Profit Hunt.

Library Tickets are used to draw Books.

Seeds are used to plant Herbs.

Gearwheels are specific game items used to unlock and upgrade drone parts.