Graveyard Keeper 2: How Tick Chance Affects Organ Removal

Graveyard Keeper 2's autopsy system introduces a percentage-based mechanic called Tick Chance that determines your success rate when extracting organs from corpses. Understanding this system is crucial for performing successful autopsies, especially when working with advanced organs.

Tick Chance represents the likelihood of achieving a successful tick during organ removal when your Mastery level falls below what the organ requires. The game calculates this percentage by dividing your current Mastery by the required Mastery. For instance, if an organ needs 2 Mastery but you only have 1, the calculation yields 50%, meaning each tick has a one-in-two chance of succeeding.

This low success rate creates significant challenges during the extraction process. While you can still remove the organ, you have minimal room for error—only one failed tick is tolerable. Failed ticks appear in red, and accumulating two or more red ticks results in permanent organ damage. The game registers this failure as a Surgeon's Error, which removes one white skull and one red skull from the corpse's overall skull rating. Additionally, a corpse with a failed organ extraction cannot be used to create a zombie.

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The Tick Chance system extends beyond autopsies into other gameplay areas. Farming uses the same mechanic, where seeds requiring higher Mastery levels than you currently possess operate on a probability basis. If a seed demands 10 Farming Mastery and you possess 6, each tick during the farming process has a 60% success rate.

To improve your odds, players should focus on increasing their Mastery levels before attempting organ removal on difficult corpses. This reduces reliance on luck and ensures more consistent autopsy outcomes. Early-game autopsies with basic organs remain straightforward, but advancing to more complex organs without sufficient Mastery requires careful planning and acceptance of higher failure risks.