Upgrades

In short

16 items bought with coins in the between-innings shop. Each sits in a slot: Bat, Glove and Cleats hold one item (buying another replaces it); Charms stack, even copies of the same charm. Their effects are stat modifiers, and their tags feed Synergies. Two Epic items start locked and are unlocked with meta points under PERKS.

How it works

• Shop pool: every upgrade that is unlocked (unlockedByDefault, or bought under PERKS). See Shop and Economy.
• Offers: RunConfig.shopOfferCount (3) offers per visit, drawn without repeats by rarity weight: Common 6, Rare 3, Epic 1. Bat / Glove / Cleats items you already own are left out; Charms can be offered again.
• Price: ceil(cost x shop multiplier): x1 Normal, x1.25 Medium, x1.5 Hard (see Difficulty).
• Stacking: RunState.AddUpgrade removes whatever is in the same slot unless it is a Charm (Stacks => slot == Charm). All modifiers then stack through one rule: final = (base + sum of Adds) x (1 + sum of Percents), never below 0. Percent values add together, they do not multiply. See Upgrades and Synergies and Stats System.
• Buttons (#38 currency icons): the shop’s BUY and REROLL buttons show a coin icon and the price; the PERKS popup’s buttons show the purple points gem and the price.
• Index: the main menu INDEX lists every upgrade under EQUIPMENT, in sub tabs BATS, CLEATS, GLOVES and CHARMS, Common first, then Rare, then Epic, with its modifiers and tags (Index Screen).
• PERKS popup (lobby top bar): “PERK UNLOCKS” lists locked upgrades with a points-price button; the PERKS tab shows a marker when you can afford one. See Meta Progression.

Numbers

id	Name	Slot	Rarity	Price N / M / H	Tags	Modifiers	Unlock
maple_bat	Maple Bat	Bat	Common	5 / 7 / 8	Power	+8% Power	default
corked_bat	Corked Bat	Bat	Rare	9 / 12 / 14	Power, Risky	+18% Power, -10% Contact	default
launch_bat	Launch Pad Bat	Bat	Rare	8 / 10 / 12	Lift	+5 Launch Angle (flat, degrees), +4% Power	default
titanium_bat	Titanium Bat	Bat	Epic	14 / 18 / 21	Power, Risky	+30% Power	80 PTS
sweet_tape	Sweet Spot Tape	Glove	Common	5 / 7 / 8	Contact	+20% Contact	default
batting_gloves	Batting Gloves	Glove	Common	5 / 7 / 8	Timing	+15% Timing Window	default
pine_tar	Pine Tar Grip	Glove	Rare	8 / 10 / 12	Power, Contact	+6% Power, +10% Contact	default
sweet_spot_sticker	Sweet Spot Sticker	Glove	Rare	7 / 9 / 11	Green, Contact	+0.15 Green HR Score (flat, +15%), +10% Contact	default
spikes	Spiked Cleats	Cleats	Common	5 / 7 / 8	Power	+6% Power, +2 Launch Angle (flat)	default
comfy_cleats	Comfy Cleats	Cleats	Rare	9 / 12 / 14	Endurance	+2 Extra Outs (flat)	default
lucky_penny	Lucky Penny	Charm	Common	4 / 5 / 6	Greed	+1 Coins per HR (flat)	default
showboat	Showboat Chain	Charm	Rare	8 / 10 / 12	Style	+25% HR Multiplier	default
coupon	Reroll Coupon	Charm	Common	3 / 4 / 5	Greed	+1 Reroll Discount (flat)	default
green_light	Green Light	Charm	Common	5 / 7 / 8	Green	+0.25 Green HR Score (flat, +25%)	default
hot_streak	Hot Streak Wristband	Charm	Rare	8 / 10 / 12	Green, Style	+0.15 Green Streak Score (flat, +15% per green in a row)	default
metronome	Pocket Metronome	Charm	Epic	12 / 15 / 18	Timing, Style	+25% Timing Window, +15% HR Multiplier	60 PTS

Descriptions: Maple Bat “Solid wood.”, Corked Bat “Don’t tell the umpire.”, Launch Pad Bat “Built for lift.”, Titanium Bat “Definitely not league legal.”, Sweet Spot Tape “Bigger barrel feel.”, Batting Gloves “Quicker hands.”, Pine Tar Grip “Sticky and powerful.”, Sweet Spot Sticker “You can feel the barrel.”, Spiked Cleats “Dig in and drive.”, Comfy Cleats “Stay in the box longer.”, Lucky Penny “Finders keepers.”, Showboat Chain “Admire every dinger.”, Reroll Coupon “Clipped from the program.”, Green Light “Perfect swings pay more.”, Hot Streak Wristband “Keep the greens coming.”, Pocket Metronome “Perfect rhythm.”

Count	Value
By slot	Bat 4, Glove 4, Cleats 2, Charm 6
By rarity	Common 7, Rare 7, Epic 2
Rarity weights in the shop	Common 6, Rare 3, Epic 1 (ShopService.RarityWeight)

In the code

File	What it does
Assets/_Project/Scripts/Data/DefaultContent.cs	Upgrade(id, name, slot, rarity, cost, description, tags, modifiers...); Metronome and Titanium Bat locks
Assets/_Project/Scripts/Data/UpgradeDefinition.cs	EquipmentSlot, Rarity, Stacks, Describe()
Assets/_Project/Scripts/Upgrades/ShopService.cs	Offers, rarity weights, buying, rerolls
Assets/_Project/Scripts/Run/RunState.cs	AddUpgrade (slot replace / charm stack), PriceOf, RecalculateStats
Assets/_Project/Scripts/UI/LobbyNav.cs	PERKS tab and PERK UNLOCKS popup
Assets/_Project/Scripts/Data/IndexCatalog.cs	Lists upgrades as Equipment in the INDEX

Gotchas

• Bat upgrades also pick the 3D bat model shown (BatModelLibrary has entries for all four), unless a bat cosmetic is equipped, which overrides the look. See Cosmetics.
• Buying a new Bat, Glove or Cleats item throws away the old one with no refund.
• Green HR Score and Green Streak Score are flat Adds even though they read as percentages.
• Coins per HR, Extra Outs and Reroll Discount are read with GetInt (rounded), so a fractional value would round.
• “Perks” in the lobby means locked shop upgrades; batter “level perks” are a different thing (see Batters).

Related

• Synergies: tag bonuses
• Upgrades and Synergies: the rules
• Shop and Economy: coins, offers and rerolls
• Stats: what each stat does
• Add an Upgrade