The game is uses asynchronous PvP battle system.
This means that opponent players that you face are not Live.
Players' backpack are saved to the server, and it is recalled to face another player for certain time frame.
The time frame how long a build is saved and used in the battles is not specified.

Since the game is not a Live PvP, you are able to play the game at your own pace, without any countdown timer.
If you wish to continue the game at later time/date, you can press ESC(or setting) to exit the game and continue later.


Note, however that conceding a ranked game will result in penalty.

Backpack Battle has three game modes:
- Ranked
- Unranked
- Other Game Modes





Ranked Game
Your objective is to win games to climb the ladder.
(At this point, there is no Seasons and Rewards system)
The higher the rank you become, more challenging it is to win the rounds.
As already said, if you concede a game, you will take rank penalty.


The rank tier order is as follows:
‏‏Bronze >> Silver >> Gold >> Platinum >> Diamond >> Master >> Grandmaster >> Grandma

Numbers in the badge is your progress in the rank tier.
Reaching 100 will move you to the next tier in the rank.



Unranked Game
Regular game without rank ladder involved. No penalty for conceding.
You may play at ease to test builds and quit the run whenever you'd like.




Other Modes

When you start a game mode, you will be taken to Furcifer's shop.
Using the (Gold) s you have, you can buy items.

To buy an item, left click an item, and drag it to your inventory or the storage.
Furcifer may offer sale item at 50% off (rounded up).

To sell an item, left click an item, and drag it to Furcifer's mimic chest (AKA Chestnut).
Resale value of your items are 50% (rounded up).
You could strategically purchase discounted item from Furcifer, and resell it at full return cost.

Shop item appearance probability can be viewed by moving your mouse pointer over the 'Shop' banner, at the top of Furcifer's shop item shelf.


The item rarity probability will shift toward's items with higher rarity over the course of the rounds. This means that you will have low chance to see Common and Rare items later in the rounds. Hence plan ahead strategically. (for specifics, view https://backpackbattles.wiki.gg/wiki/Game_Mechanics#Shop_Mechanics )

The item sale chance is displayed.

The (Trueasure-item) appearance chance is displayed, along with how many you may have at a time.




To reroll and refresh the shop items to another set of random items, click and pull down the Reroll rope.
Note: Unique items are only offered before rerolling, for each round





Item Reserving
You are able to right click on item's price tag or left click on the item in the shop to reserve it.
Reserved item(s) will not be refreshed when you pull down the reroll rope.
Reserved item(s) are retained to next time you visit the shop.




Item Combining
While hovering your mouse over an item, if you see blue line that is linked to another item, it means that those items can be combined together.



When you move those items that can combine next to each other, it will display text of resulting item. It will show thin gold line if all recipes are not yet ready, as you see in the screenshot "Hero Sword 1/2".



Once all the recipes are next to each other, you'll see a thick gold line, as you see in the screenshot "Hero Sword 2/2".
When you return to the shop next round, item will combine to an item.




Item Combine Remainder
Above, you saw blue and gold lines for combining items.
Here, you'll see green lines. Green line means that after you combine items for a recipe, there will be item(s) that will not disappear afterward. In below instance, Blood Amulet will not disappear after creating Vampiric Potion.



You'll notice in the Recipes menu and in Items Info, in green font and green background color respectively.





Item Locking
If you wish to prevent item to combine, you can lock it by right clicking on the item.
You may do this at Battle Phase as well, if you forgot to do so.





Furcifer will give you game tips time to time, or you can click on him.



When you are ready for battle, you can click on 'Start Backpack Battle' banner.
If you accidentally clicked start or wishes to make changes, you can click anywhere (except Furcifer and your character area at the bottom) on the screen to stop the battle from starting.

The combined item will be accessible after battle, when returned to the shop.



Guaranteed Shop Events and Unique Items

• Round 3 : Unique Skill item(s) offered
  
• Round 8 : Unique Subclass items offered
  
• Round 10 : Unique Skill item(s) offered

When full skill/subclass item shop is offered, choosing one or rerolling to skip it will return to regular shop. These items cannot be Reserved.

Battle will be held without any user intervention. Battle is automatic.
Player may change speed of the game using the battle speed bar.

Player may click on 'Open Log', to view the battle log after battle has ended.
You may view battle stats in it, and view each battle actions step by step.

As already mentioned, if you've forgotten or wishes to change item lock for recipe combination, you may do it in this phase as well.

Each round consists of item shop and battle.


Each game run gives you
If you lose all Hearts, the run will end as a lost.
Whenever you win a round in the run, you win a (trophy).

Upon surviving Round 7, 1 will refill, before entering subclass item shop.


Once you are able to win 10 trophies, you will be given option to either:

• Take the win with offered rank points, and end the run

OR

• Continue as Survival Mode with 1 refilled. In survival mode, you have opportunity to obtain more rank points, at the risk of only being rewarded low amount of rank points if you fail to survive through round 18.
  

After the run has completed, if you played rank, your rank points will be added to your class. And, your trophies will be summed up, and be rewarded to you.
Using the trophies, you are able to purchase your character(s)' cosmetics at Wardrobe.

(Effect)-damage is a distinct damage type that ignores opponent's spikes and shields.




buff count is the cap damage that can be returned, in response to opponent's melee/ranged damage that you receive (excluding damage prevented by shields).


have two attributes of RDL (Return Damage Limit):

• (melee-attack)
  
• (ranged-attack)

Default RDL for
• is 100%
  
• is 0%

With introduction of item Amulet of the Wild, the buff description were changed, referring "100%". This percentage being referred below, is RDL of -damage.‎
‏‏‎



-Damage is calculated as:

attackDamage = opponent.attack.attackDamage
RDLpercentage = player.getRDLpercentage(opponent.attack.type)
spikes = player.buff.spikes

RD = Math.ceil(attackDamage * RDLpercentage)

if (RD >= spikes)
{
returnDamage = spikes
}

else if (RD < spikes)
{
returnDamage = RD
}

Opponent's damage is returned (melee 100%), where return damage is limited to your spikes count.
With Amulet of the Wild, opponent's damage is returned <melee: 100% + (50% per amulet) OR ranged: (50% per amulet)>, where return damage is limited to your spikes count.
This means -- with Amulet of Wild, opponent may receive more returned damage than they inflict. The RDL increase work favorably against opponent attack damages that are lower than your buff count.


All shields have synergy with , but not .
However can be used, if incorporating Amulet of the Wild with items like Moon Shield or Sun Shield



Other related items:

Quality in increasing order: chipped, flawed, regular, flawless, perfect


When gemstones are socketed, it does not directly interact with other items. It will interact with only the item it is socketed to. The socketed gems also do not get effected by other items that starred the item that gem is socketed to.




Note: Ambiguity
When an item says it will duplicate buff/debuff with chance percentage, it does not mean it will duplicate the whole <set of buffs/debuffs of an item> with percentage chance. The chance is applied to each individual buff/debuff independently.

Related Items:

• Crow
  
• Double Rainbow
  
• Heart Shield
  
• Magic Badge
  
• Owl Spirit Companion
  
• Paradise Birb
  
• Puzzlebag of Improvement
  
• Puzzlebag of Ruin
  
• Serpent Staff
  
• Solaris
  
• Tiger Rune
  
• Twine Badge

Reflect debuff is not accounted in the debuff duplicated.

Related Items:

• Cold Mirror
  
• Dragon Knight
  
• Moon Armor
  
• Platinum Customer Card
  
• Power of the Moon
  
• Reverse!
  
• Ruby Egg
  
• Ruby Whelp

"Cleanse effects" here refers to an item's trigger that would do debuff cleanse.
It will do ONE additional debuff cleanse.
It does not refer to <debuffCountBeingCleansed> * <25%ChanceForAdditionalToBeCleansed>.


Other Related Items:

• Turbo Shelly

(NEED VERIFICATION)
The buff refund occurs after accumulation of buffs used. Buff is refunded when it reaches at least one buff of a type, that can be refunded.
(For example: buffUsed.buffType * 25%)

Related Items:

• Amulet of Energy
  
• Puzzlebag of Energy

Items with description '.. random item(s)' are without class restriction, even gated items. However excludes Playing Cards and Chess Pieces, unless you have the respective item that ungate them.

Related Items:

• Amulet of Feasting
  
• Bag of Giving
  
• Present
  
• Shovel

Steal buff value is not accounted as part of opponent buff removed value.





'Trade offer' refers to unique dialogue from Furcifer, offering to exchange one of your item for another item with equivalent (or +1) value. The dialogue may pop up when you equip related item. Drop the item into Chestnut to trade. Rerolling will withdraw the trade offer.



Related Items:

• Li'l Chestnut
  
• Customer card
  
• Platinum customer card
  
• Scale

The potion gets consumed before the stamina using item goes (honk) out-of-stamina.

Shop purchased class item badges do not effect offered subclass items for your starting class.






Stone Badge generate 1-2 items worth 1 (gold) each. Item being generated is without class restriction.




Friends of the Forest are:

• Rat
  
• Squirrel
  
• Hedgehog

Once all items on its has repeated, this item cease to trigger.





Shovel will generate 1 item that is worth 1-4 s.





Shovel will generate 1 item that is worth 3-6 s


List of items that can be dogged up by Shovel and their probability can be found at https://backpackbattles.wiki.gg/wiki/Shovel
(The list uses v0.9.20, without Dig Deeper. NEED UPDATE)




Piggybank will break into 2-3 items that are worth 13-16 s combined, plus 1-2 s.





Note #1: Ambiguity
The third effect, second sentence: in 'Shop entered' effect description is ambiguous and faulty.

It is not "Create <a Flame> and <different items based on the combined value>".
It is more precisely: "Create <Flame(s) and different items> based on the combined value".

You can get two Flames. It is not always "a Flame".
Bowl does not create item that is worth 1 except for Flame.
Hence after creating items, it will have 1 or 2 remaining, that gets turned into Flame(s).

Note #2:
When 'Unstable Recombobulator' or 'Stable Recombobulator' is fed,
Offering Bowl takes consume effect, while Recombobulator's item consume effect gets disabled



Recombobulators and 'Offering Bowl' may create items with total consumed value +1 .


(NEED VERIFICATION) What happens if two Recombobulator (of the same type or different type) effects each other?




Description specifically says "attack effects". Not "weapon effects", nor "trigger effects".

"Attack effects" include effects such as 'On hit', 'On attack', 'On miss'(NEED VERIFICATION).

This does not include 'On stun' effect.





Creates highest possible quality gems. value is rounded up.

Note: Ambiguity
"Increase Mana cost by 3"
Mana cost increase applies to this 'Shiny Mantle' only.
It does not apply for player's all items.






<..> Collar's perimeter increases by 1.






s leftover from previous round is accumulated into the item being received.

Note, in case you have item like Piggybank, that "Shop entered" effect triggers in the order item has been added to inventory. Move it to storage, and place back to inventory to change trigger order.

Note: Ambiguity
Is it "...for each <> and <>,
or is it "...for each < and >"?

Updated Item Effects Description
At bottom of item description, effect that the item gains from bag(s) are appended, if it would.
It doesn't, however append effect description from other items that it would be affected.




Item Sockets
Player cannot view the item socket count in Recipe page directly. Player must mouse-over a gem 'Burning Coal' in the Recipe page, or mouse-over the item in Items library. (In case you wanted to view socket count before crafting it)




Recipe
At Recipes page, mouse-over class name at top left to display a dropdown menu, to select another class' recipe.


Note, that there is an unlisted recipe:
Hammer + Piggybank -> Hammer + Bunch of Coins
Bunch of Coins can be sold for 5.


Recipes are not class restricted. The ingredients, however are.
To acquire other class' ingredients, unique Badge item or item-creating utility item effect are required.
This does not imply that player can acquire subclass other than its own starting class.




Achievements
Achievements can only be obtained via Ranked/Unranked games; it cannot be obtained in Other Game Modes.




Item Library Interactions




Other Shop Phase Interactions




Other Shop Phase or Battle Phase Interactions

Basic interactions and options can be viewed in game Settings.

Read more about the game mechanics here:
https://backpack-battles.fandom.com/wiki/Game_Mechanics