Resources

To progress through and play the game, the player has to use certain **resources**, both in and out of combat.

## Courage

**Courage** is the primary resource that players use to summon a majority of units during missions. The meter always starts at 10 at the beginning of the level. It replenishes itself at 1.5 points per second, allowing to constantly send out units whose price is evaluated in it.

Killed enemies have a chance to drop packs with 25 courage throughout the level, and Generator can be used to create them every 15 seconds. The Rednecks have team powers that may randomly spawn 25-courage packs. Extra Courage buff can be used to gain three additional packs of 10 courage over the course of 22 seconds.

## Rage

**Rage** is a secondary resource for unit summoning. The meter always starts at 2 at the beginning of the level. Unlike courage, it does not replenish itself and can only be earned by killing enemies. Weak enemies are usually worth 1 or 2 rage points, with stronger zombies generally granting more rage points depending on their health and damage. Boss enemies and Free Hugs always grant 50 rage on death. Enemies emitting a red aura grant an additional 15 rage points along with their usual amount, totaling up into one number.

Rage is mostly used for deploying stationary support units and using Bill's LMG. A handful of human units also require rage to deploy. It is also used for Bill's grenade throw, an ability exclusive to the Princess Rescue event.

## Fuel

**Fuel** is a resource that is used for entering missions and exploring areas of location maps. Starting and restarting a level requires 2 points of fuel, and opening undiscovered map tiles consume 1 point of fuel. Events and Supply Runs do not cost any fuel to enter.

Fuel automatically refills itself by one unit per 10 minutes, and as such, players should take advantage of this and keep a part of their tanks empty lest they miss out on free potential fuel. A maximum of 20 fuel can be stored and obtained by waiting. Players can gain fuel by the following means:

* Leveling up rewards 4 fuel.
* Stashes with up to 4 fuel can be found on a map.
* Advertisements, offered when players are low on fuel, provide 2 units of fuel each. They can be watched indefinitely until they reach the fuel limit or close the offer popup while having more than 2 fuel. Fuel continues refilling over the course of watching them, and as such they may exceed the fuel limit. It is also possible to exhaust the number of ads that can be viewed, requiring some time before another ad can load.
* Players can choose to spend money for a fuel refill. The exchange rates are as followed:
	+ 2 fuel for 2 money.
	+ 10 fuel for 9 money.
	+ 30 fuel for 25 money.

Aside from waiting, advertisement farming is often the most efficient method of refilling fuel in many cases.

## Keys

**Keys** are a special item used to unlock blue stashes rewarded at the end of Supply Runs.

### Blue Keys

**Blue keys** are regular keys that can can obtained by the player from various sources. Stashes on the world map, star rewards and obtaining all stars in a stage will give them out as a one-time reward. Free gifts containing two are offered at random, and 40 cash can be used to purchase then in batches of 8. Provided if the player has less than 8, they will gain an extra key every three hours automatically. A maximum of 99 blue keys can be stored at once.

### Red Keys

**Red keys** are special keys that can only be obtained via crafting and by going up a league in Skirmish. Both methods reward one red key at a time. Crafting a key costs 2 green cash, and can be done as long as the player has less than 5 of them. It is possible to exceed that number by receiving them from Skirmish. Red keys yield double the rewards compared to a blue key, making it priceless on difficult late-game Supply Runs where high-rarity items are often desperately sought for.

## Power Points

**Power points** are a crucial resource for upgrading units' levels. There is a 1:1 power points to coins ratio when upgrading.

They can be obtained in many ways. This includes beating missions and challenges for the first time, finishing certain supply runs, receiving as Daily Gifts, purchasing from Trader, rewarded for completing unit mastery tasks, reaching personal event goals, earned from chapters both from certain individual tasks and upon full chapter completion, and by opening stashes on location maps.

## Event Tickets

**Event tickets** are a special type of resource necessary for participating in events.

Each event ticket grants the player one attempt at the event that is currently happening. There is no limit to how many tickets can be spent during any given event as long as the player has them.

Two free tickets are given out whenever an event starts. Additional tickets can be obtained by purchasing them with money from Trader while an event is currently happening. In the past, they could also be obtained by opening military or legendary cases,