Shop

The Shop is where you can buy items and weapons for your character. It is the only source of weapons in the game (whereas items will also drop in the form of loot crates).

In the game, and on this page, when something refers to "items" in the shop, it usually means both Weapons and Items, unless specified otherwise.

You enter the shop automatically after each wave (so the first shop is the one after the first wave). The shop title shows the number of the wave that just ended.

The shop will offer up to 4 random items. The choice of items is not completely random, but also influenced by your character, Luck, and (in the case of weapons) which weapons you already possess; furthermore, the selection of items is specially restricted in the first 5 shops (see below).

Average item rarity increases as waves progress, and is also modified by Luck. There is a minimum wave before each tier of item can begin to be found in crates and in the shop. Tier 2 items can appear from Wave/Shop 2+, Tier 3 from Wave/Shop 4+, Tier 4 from Wave/Shop 8+.

The collection of shop items can be refreshed by rerolling (see below). Rerolling costs a fee that increases with each reroll performed in the current shop, but there is otherwise no limit to the number of rerolls. Certain weapons are never offered for some characters (for example, characters that can only use melee weapons will not be offered ranged weapons).

Each offered item can be purchased with Materials, or locked. Locked items keep their current price and stay in the shop for as long as they are locked.

Item prices depend on their base cost and item rarity, and will increase with each wave.

Finally, the price of items in the shop can be modified with the Coupon item. Some characters also start with an initial shop price modifier.

Mechanics

Rerolling

It is possible to refresh the items and weapons on offer by purchasing a reroll with materials. The reroll price depends on the current wave, and increases with each reroll performed; it will reset to an increasing base value with each shop.

There is no limit to how many times you can reroll, except that you must be able to afford the increasing price.

Rerolling is also possible when the character levels up and is offered a selection of upgrades. This rerolling uses the same prices as the Shop.

The price for rerolls resets between level-ups and the shop, so rerolling your level-ups doesn't affect the cost of rerolling in the shop. And rerolling in one wave's shop doesn't affect the prices of rerolling in the next wave. However, if you gain 2 or more levels in one wave, the reroll price is shared between the level ups.

When a reroll is purchased, all items/weapons in the shop will be refreshed except for those that are currently locked. The new items/weapons are chosen randomly, but they can't be the same as any of those items/weapons from the previous shop.

The item Dangerous Bunny gives you 1 free reroll in the shop for each one you have (see the item description for details).

Buying all 4 items in the Shop reduces the cost of the current reroll to 0. However unlike the free rerolls from Dangerous Bunny, the price of the next reroll is still increased.

Reroll Price

Rerolling costs an amount of Materials that depends on the current wave. Each additional reroll has its cost increased by a flat amount that also depends on the current wave.

The Reroll Increase is calculated as follows:

Reroll Increase: Rounddown(0.5 * Wave Number) (Minimum of 1)

and the price of the first reroll is:

First Reroll Price: Wave Number + Reroll Increase

Notes:

In Endless Mode the reroll price is multiplied by the endless Factor. See Endless Mode Rerolling for costs at higher levels.
Every reroll increases the price by the reroll price.

So at the end of wave 5, with the upgrades and shop that follows, the reroll increase is 0.5 * 5 = 2.5, which is rounded down to 2. So the first reroll costs 5+2, and each following reroll increases by +2.

Here are a table over reroll costs for the 20 waves.


Wave	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
First Reroll Price	2	3	4	6	7	9	10	12	13	15	16	18	19	21	22	24	25	27	28	N/A
Price Increase per Reroll	1	1	1	2	2	3	3	4	4	5	5	6	6	7	7	8	8	9	9	N/A

Locking

You can lock and unlock items by clicking the lock under each item. Locking is free and can be done as often as you like. While an item is locked, it will stay in the shop when the shop is rerolled and it will also stay in the shop between waves if you begin the next wave. If you keep an item locked between waves, its price also remains locked and isn't increased by inflation.

While an item is locked, that item cannot appear in the other slots in the shop. (Fisherman locking Bait is the one exception, where you will still get your guaranteed Bait on a reroll.)

If you lock a Unique Item, it cannot show up in Loot Crates while locked. Regular items can still show up in Loot Crates while locked.

Combining

If you have two identical weapons equipped, you can click one of the weapons and choose combine. This combines the weapon with another weapon of same type and tier into one weapon of one higher tier.

Also, if you have filled your weapon slots and buy a weapon that is identical to one you have in your weapon slots, the two will automatically combine to the same weapon of one higher tier.

For example, two Tier 1 Knife can be combined into one Tier 2 Knife

Knife

And finally weapons cannot be combined above Tier 4

Knife

Recycling

You can recycle your Weapons and Items found in Crates to get a percentage of their value back, at the cost of losing the item or weapon.

The default is to get 25% back when recycling. Recycling Machine can increase this value by 35% for a total of 60% back.

This stacks with the +25% from Entrepreneur for a total of 85%. Rewards for recycling are based upon the current price of the item, so it increases with inflation, but decreases if you have coupons, since it scales with your shop price secondary stat.

In Endless Mode, Shop Prices increases sharply by the Endless Factor, but the increase isn't applied to the recycling value.

Elite and Swarm Radar

On danger 2+ the shop will display which waves contain which waves have swarms or elites in. See Elite and Horde Waves

Shop Prices And Inflation

Each item or weapon has a base price. When you see the item/weapon in the shop it will have inflation applied to its price. Even the first shop has already have inflation applied.

The equation is:

Final Price =  (Base_Price + Wave + (Base_Price * 0.1 * Wave)) * Shop_Price

Note that:

Items have a minimum cost of 1 Materials. The Price is also Rounded Down.
Wave is the current wave. When you finish wave 5, it means that 5 is used as the number for the following shop.
Shop_Price is the secondary stat affected by Coupon and characters with changed shop prices like Mutant
Base_Price is the base price of items. You can see the base price of items at the Items and the Weapons Pages. This base price can be modified by Arms Dealer.
In Endless Mode the Item Price also increases with the Endless Factor.

This Final Price is the price you will see in shops, and it is also the value that is used for recycling. The increase in price with each wave is referred to as the Inflation of prices.

So for example, a SMG has a base price of 20. So when we see it in the first shop, its price is:

SMG Price = 20 + 1 + (20 * 0.1 * 1) * 100% = 20 + 1 + 2 = 23.

And in another example, We see a Cyclops Worm (45 base price) in the 5th shop.

Cyclops Worm Price = 45 + 5 + (45 * 0.1 * 5) * 100% = 50 + 22.5 = 72.5

The Final price is then rounded down, and it will cost 72. If you had 2 Coupon's

72.5 * 90% = 65.25 = Final Price 65

Since the Equation includes + Wave addition to the 10%, cheaper items will be hit harder by inflation, and will be slightly less cost effective late game.

Locked items are not affected by inflation if you keep them locked between shops.

Rarity of Shop Items and Luck

Here are tables for the progression of item/weapon rarity in the shop and item crates. The shops appear at the end of each wave. So at the end of wave 1, the first shop appears. You can see the shop wave number in the top left corner while shopping.

Available From Wave tells you the first wave where you can encounter the rarity. ("Min Wave" is a number used in the game's coding)

	Available From Wave	Min Wave	Base Chance	+Chance per Wave	Max Chance
Tier 1	1	1	100%	0%	100%
Tier 2	2	1	0%	6%	60%
Tier 3	4	3	0%	2%	25%
Tier 4	8	7	0%	0.23%	8%

Calculation for chances are done by:

= ((Chance per Wave * (Current Wave - Min Wave)) + Base Chance) * (100%+Luck)

Chance per wave starts adding chance after the Min Wave. This value cannot exceed Max Chance.

Odds of each Tier are checked progressively, starting with Tier-4. So e.g. at maximum Luck, there's an 8% chance of a Red, then of the remaining 92% there's a 25% chance of a Purple (=23%), then of the remaining 69% there's a 60% chance of a Blue (=41.4%), and then the remainder is your White chance (=27.6%).

Rarities with 0 Luck

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
Tier 1	100%	94%	88%	80.36%	72.96%	65.80%	58.88%	52.08%	45.55%	39.29%	33.29%	32.42%	31.56%	30.70%	29.84%	29.38%	29.31%	29.24%	29.17%
Tier 2	0%	6%	12%	17.64%	23.04%	28.20%	33.12%	37.71%	42.05%	46.12%	49.94%	48.63%	47.34%	46.05%	44.76%	44.07%	43.97%	43.86%	43.76%
Tier 3	0%	0%	0%	2%	4%	6%	8%	9.98%	11.94%	13.90%	15.85%	17.79%	19.72%	21.65%	23.56%	24.48%	24.43%	24.37%	24.31%
Tier 4	0%	0%	0%	0%	0%	0%	0%	0.23%	0.46%	0.69%	0.92%	1.15%	1.38%	1.61%	1.84%	2.07%	2.3%	2.53%	2.76%

Luck increases these chances by x%, but that still cannot exceed the Max Chance.

Rarities with 50 Luck

Increases chances by 50% (*1.5), up to the Max Chance:

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
Tier 1	100%	91%	82%	70.81%	60.16%	50.05%	40.48%	33.88%	32.57%	31.27%	29.98%	29.48%	29.38%	29.28%	29.17%	29.07%	28.97%	28.86%	28.76%
Tier 2	0%	9%	18%	26.19%	33.84%	40.95%	47.52%	50.82%	48.86%	46.91%	44.97%	44.22%	44.07%	43.91%	43.76%	43.60%	43.45%	43.29%	43.14%
Tier 3	0%	0%	0%	3%	6%	9%	12%	14.95%	17.88%	20.78%	23.67%	24.57%	24.48%	24.40%	24.31%	24.22%	24.14%	24.05%	23.97%
Tier 4	0%	0%	0%	0%	0%	0%	0%	0.35%	0.69%	1.04%	1.38%	1.73%	2.07%	2.42%	2.76%	3.11%	3.45%	3.8%	4.14%

Rarities with 100 Luck

Increases chances by 100% (*2), up to the Max Chance:

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
Tier 1	100%	88%	76%	61.44%	47.84%	35.20%	33.60%	31.85%	30.12%	29.59%	29.45%	29.31%	29.17%	29.03%	28.90%	28.76%	28.62%	28.48%	28.34%
Tier 2	0%	12%	24%	34.56%	44.16%	52.80%	50.40%	47.78%	45.18%	44.38%	44.17%	43.97%	43.76%	43.55%	43.34%	43.14%	42.93%	42.72%	42.52%
Tier 3	0%	0%	0%	4%	8%	12%	16%	19.91%	23.78%	24.66%	24.54%	24.43%	24.31%	24.20%	24.08%	23.97%	23.85%	23.74%	23.62%
Tier 4	0%	0%	0%	0%	0%	0%	0%	0.46%	0.92%	1.38%	1.84%	2.3%	2.76%	3.22%	3.68%	4.14%	4.6%	5.06%	5.52%

Item & Weapon Chances

Item/Weapon Chance

Most waves have a fixed chance for either an Item or Weapon to appear in the Shop:

Chance for Item: 65%
Chance for Weapon: 35%

However, early rounds guarantee a weapon to appear:

Wave 1 & 2: Exactly 2 Weapons + Exactly 2 Items.
Wave 3, 4, & 5: Guaranteed 1 Weapon + 3 slots rolled normally (can be either weapons or items).
Rest of the Shops (Wave 6+): No guarantees.

Item Tags

Characters with "wanted tags" (which are Item Tags that suit their playstyle) have a higher chance to find an item with that tag:

Whenever an item appears in the shop, it has a 5% chance to be selected from an item pool of your tagged items, instead of the regular item pool. This guarantees that the item has one of your character's tags.

Considering the 65% for a item, the actual chance is: 3.25% per slot in the shop to give you an item through the Tag System.

Note that tagged items are found both in their tagged item pool, but also in the general item pool. So if the 5% chance doesn't happen, you can still find those same items in the general item pool with all the items in the game.

Weapons & Classes

When a weapon appears in the Shop (35%), there is a chance to match an owned weapon, or an owned weapon's class (eg. Blade, Unarmed).

When the weapon appears, it is randomly chosen from one of the following three pools:

Same Weapon Pool: 20% - Weapons of the same type as you already have equipped.

Same Class Pool: 15% - Weapons that share one or more Weapons Classes with weapons you already have. (This can give you the same type weapons as you already have)

All Weapons Pool: 65% - All Weapons in the game that are possible.

This means that weapon classes with fewer weapons give you a higher chance to find the weapon you're using.

The shops for waves 1-5 also have a bonus chance for the same weapon class. The bonus is higher for earlier waves.

Shop(Wave)	1	2	3	4	5	...	6 - 20
% Bonus	15	12	9	6	3	...	-
% Bonus + Base (15%)	30	27	24	21	18	...	15

This bonus allows for a build selection in early game, since the first 2 shops guarantee two weapons, and the next 3 shops guarantee at least one weapon.

Modifiers

Item Cost

Coupon reduces shop prices by -5%, and is the only item that can do this. Shop cost reductions stack additively and the total can be seen in the secondary stats tab. The maximum cost reduction you can have is currently 50% by playing Entrepreneur and having the maximum amount of 5 coupons.

Waves

Harder waves give better shops.

Specifically, each new wave increases the chance for rarer items, as shown in Rarity of Shop Items and Luck above (see "current wave" in the calculations).

Characters with shop modifiers

Bull is the only character that will not get offered any weapons at all, since they cannot use weapons. They will only get offered items.
Demon pays with Max HP in the shop, instead of materials (weapons still recycle into materials, as do items from loot crates).
Entrepreneur starts with a -25% Items Price buff.
Saver and Mutant start with a +50% Items Price debuff.
Glutton starts with a +25% Items Price debuff.
Ranger Will only get offered ranged weapons in the shop, as they can not equip melee weapons.
Gladiator Will only get offered melee weapons in the shop, as they can not equip ranged weapons.
Knight Will only get offered melee weapons of at least tier 2 (blue). They can not equip ranged weapons.