Cash

Summary
Money can be earned within a game by killing zombies yourself, having zombies killed by another member of your party, or obtaining it from chests during Events. You, in turn, can use this money to expand your arsenal and to launch yourself in other ways ahead of the competition.

Cash
Cash is the main currency of R2DA. It doesn't appear physically within the game, but it's still an integral part of your survival.

You can also purchase cash in the menu by clicking the "Cash Shop" button in the store or the "Buy Gold" button in the bottom right of the menu. The options for buying cash range from paying 100R$ for 1000$, 450R$ for 6000$ and 1000R$ for 15000$.

Coins
The old currency of R2DA, coins, were dropped by killing a mob and the coin would differentiate in value depending on what was killed. As this drop system is now deprecated, money is now given to you automatically whenever you kill a mob. You don't have to manually run over to pick up coins anymore.

Earnings
You gain values from here if you are not in a Party or if at least 1 member of your Party is dead.
 * Zombie: 10
 * Ticker: 30
 * Edgar: 25
 * Brute: 100
 * Leaper: 30
 * Elemental: 40
 * Digger: 50
 * AI Zombie: 5

Party Earnings
You gain values from here if you are in a Party, all members of the latter alive, and you get the kill.
 * Zombie: 15
 * Ticker: 45
 * Edgar: 38 / 37
 * Brute: 150
 * Leaper: 45
 * Elemental: 60
 * Digger: 75
 * AI Zombie: 8 / 7

Party Bonus Earnings
You gain values from here if you are in a Party, all members of the latter alive, and someone else in it gets the kill.
 * Zombie: 5
 * Ticker: 15
 * Edgar: 12 / 13
 * Brute: 50
 * Leaper: 15
 * Elemental: 20
 * Digger: 25
 * AI Zombie: 3 / 2

Trivia

 * On the screen to buy yourself a currency boost, Cash is referred as Gold.
 * Cash earned from Chests or finishing portions of the Chronos Quest is not boosted nor shared with Party members.
 * Party earnings from killing any zombies will give you extra 50% of the zombie kill reward.
 * For example, you get 40$ for killing an Elemental, but with the Party bonus, you actually receive 60$, since half of 40 is 20, and 40 + 20 is 60.
 * The reason that the Edgar reward differentiates is due to the game sometimes rounding up and sometimes rounding down as 25 * 1.5 = 37.5. Same thing goes for AI Zombies.