The player's Luck increases the odds for rare events to occur during a run.
General Description
Luck improves the chances for the player to experience more lucky events. This is done by having every luck-based event in the game include a luck modifier attached to it. The prime examples of these are the drops of Fertilizer, Pickaxes, higher tier seeds, and rare seeds, including Heart Beet, Rose, Pumpkin, and Sunflower seeds. Dicey's Casino is also affected by this as well. In essence, the higher the player's Luck is the more likely they are experience more of these positive events. For the majority of these examples, this simply means more drops of those pickups, with the rate of this varying between each given object. For Fertilizer specifically, one Luck equates to about +1% Fertilizer drop chance. For Dicey's Casino, this means increased chances to get the jackpot or otherwise better drops.
Probabilities
Luck affects specific probabilities of some aspects of the game. How Luck impacts an event is defined by the following equation:
(Luck * EventProbability) + 1 = NewEventProbability
Where Luck is a percent, EventProbaility is the base decimal or whole number corresponding to the particular event in question, and NewEventProbability is the new probability of the event after Luck has been factored in. Some instances include, but are not limited to, what is detailed in the table below.
| Image (If Applicable) | Name/Effect | Base Probability |
|---|---|---|
 |
Alien Pet (as obtained from Alien Pods) | 0.25 |
 |
Glass Bottles | 0.5 (every 20 seconds) |
 |
Sunflower seed drop | 0.5 |
 |
Pumpkin seed drop | 1 |
Top tier seed drop (includes  Aloe,  Carrot,  Coffee, Pineapple, and  Tomato while in their respective Biome)
|
1 | |
 |
Golden Goose (up to one per each bridge-value Biome pair (ex: Desert II and Plains II)) |
1 |
 |
Fertilizer drop | 1 |
| Seed drop (such as from Enemies | 1 | |
 |
Soil pH Meter's Flower spawn chance from a Weed | 0.5 |
 |
Winning a Rose seed, a Heart Beet seed, any kind of Scroll, Farm Animal, or  Cornucopias
|
0.2 |
 |
Flower Merchant | 0.1 |
 |
Homing Pigeon | 0.1 |
 |
Jump-Start | 0.1 |
 |
Nasal Spray (chance for a Pig or a Hog to spawn a Truffle when digging)
|
0.5 |
   |
Borage, Pig, and Hog to decide to break open crust | 0.1 |
 |
Sprinkler Tractor giving a Fruit Tree sapling when used on a Fruit Tree |
0.1 |
| Seed drop from breaking open crust | 0.5 | |
 |
Tunneler Tractor chance to break extra crust (after necessary Home Improvement has been purchased) |
1 |
| Moist Soil chance | 1.5 | |
 |
Quality of the Cat rewarded at the end of the run | ? |
| Weapon rarities | ? |
Sources of Luck
There are several utilities both inside and outside the player's run that will increase Luck, including Cat Plushies, Cat Shrines, Home Improvements, Topiaries. Unless otherwise stated, all of the following increases are permanent and will affect all runs after being obtained. The specific sources can be seen below:
| Image | Name | Increase | Amount | Source Name |
|---|---|---|---|---|
 |
Alien Ant Luck Upgrade | +1% Luck | 1 | Alien Ant |
 |
Chemist Ant Luck Upgrade | +0.5% Luck | 1 | Chemist Ant |
 |
Historian Ant Luck Upgrade | +2% Luck | 1 | Historian Ant |
|
Historian Ant Luck Upgrade | +0.5% Luck | 1 | Historian Ant |
 |
Sage Ant Luck Upgrade | +2% Luck | 2 | Sage Ant |
 |
Banana Topiary | +0.5% Luck | 1 | Topiaries |
 |
Bengal Cat Plushie | +0.01% Luck per Bengal Cat | 0 to 200 | Cat Plushies |
 |
Shiny Black Cat Plushie | +0.015% Luck per Shiny Black Cat | 0 to 200 | Cat Plushies |
 |
Cosmic Cat Plushie | +0.02% Luck per Cosmic Cat | 0 to 200 | Cat Plushies |
 |
Void Cat Plushie | +0.03% Luck per Void Cat | 0 to 200 | Cat Plushies |
 |
Bundit's Foot | +50% Luck (Only for that run) | 1 | Tree Guardians |
 |
Big Cat Statue Upgrade | +2% Luck | 1 | Big Cat Statue |
 |
Spring Cat Modifier | +20% Luck (Only when the given Shrine is enabled) | 1 | Spring Cat Shrine |
 |
Fall Cat Modifier | +10% Luck (Only when the given Shrine is enabled) | 1 | Fall Cat Shrine |
 |
Winter Cat Modifier | +10% Luck (Only when the given Shrine is enabled) | 1 | Winter Cat Shrine |
 |
Nuclear Winter Cat Modifier | +10% Luck (Only when the given Shrine is enabled) | 1 | Nuclear Winter Cat Shrine |
Note that for the above sources they are all additive, not multiplicative. For example, if the player already has Luck at 4% and purchase the Alien Ant Luck Upgrade, they will have a new Luck value of 5%.
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