Critical Coin is a Workshop upgrade that ties your coin income to critical hits. Once unlocked, basic enemies have a chance to drop coins when they die to a critical hit, giving you an extra source of income during a run.
Description
Critical Coin gives basic enemies a chance to drop coins when they are killed by a critical hit. It only applies to basic enemies, so elites and bosses are not affected by this upgrade.
Use
The Critical Coin card lets basic enemies drop 1 coin, multiplied by your coins per kill, when they are killed by anything other than a non-critical bullet. That means kills from Ultimate Weapons, Orbs, Thorns, Death Ray, Nuke and similar sources can all trigger the drop.
Note that this is broader than what counts for critical hit events. Those events specifically require critical bullets, even though the card itself works with a much wider range of kill sources.