Drop rates

As of October 20, 2026

Rumble Alley contains random items (paid loot boxes). The rates below are tables written by the game's own code, and the draw rates match the in-game rate screens. When a rate changes, this page changes with it.

Rates are percentages rounded to four decimal places, as on the in-game rate screens. Because of the rounding, the numbers in a table may add up to slightly more or less than 100%, but the actual rates add up to exactly 100%.

Summon level

The card draw, the companion summon and the Gear Chest each have their own summon level. It rises from Lv1 (the first draw) to Lv10 with that draw's total count (gem draws and any remaining summon ticket draws), and each level's rates are in the tables of each section. If a level is reached during a 10-draw, the new level's rates apply from the next draw. The level never goes down, and the pity, the rising rates and the pickup are the same at every level. Summon ticket draws use their own rates at every level.

Each level reached gives a reward, claimed on the level row in Shop → Draw in the game: gems Lv2 300, Lv3 300, Lv4 600, Lv5 600, Lv6 900, Lv7 900, Lv8 1,500, Lv9 1,500, Lv10 3,000. Lv6 and Lv10 also give one item of a grade, chosen by the player (card draw Lv6 Legend · Lv10 Myth card, companion summon Lv6 Hero · Lv10 Legend companion, Gear Chest Lv6 Legend · Lv10 Myth gear).

Card draw

Price: 1 draw 300 gems, 10 draws 3,000 gems (Shop → Draw in the game)

GradeGem draw (Lv1)Summon ticket draw
Common40%44.5%
Advanced30%32%
Rare17%16%
Hero8%7.035%
Legend3.5%0.45%
Myth1.2%0.011%
Ancient0.25%0.003%
Transcendent0.05%0.001%

Grade rates by level (gem draw)

LevelStarts atCommonAdvancedRareHeroLegendMythAncientTranscendent
Lv10 draws40%30%17%8%3.5%1.2%0.25%0.05%
Lv210 draws38%29.56%17.22%9.11%4.22%1.49%0.31%0.09%
Lv330 draws36%29.11%17.44%10.22%4.95%1.78%0.37%0.13%
Lv460 draws34%28.66%17.67%11.33%5.67%2.07%0.43%0.17%
Lv5100 draws32%28.22%17.89%12.44%6.39%2.36%0.49%0.21%
Lv6150 draws30%27.78%18.11%13.56%7.11%2.64%0.56%0.24%
Lv7220 draws28%27.34%18.33%14.67%7.83%2.93%0.62%0.28%
Lv8310 draws26%26.89%18.56%15.78%8.55%3.22%0.68%0.32%
Lv9430 draws24%26.44%18.78%16.89%9.28%3.51%0.74%0.36%
Lv10600 draws22%26%19%18%10%3.8%0.8%0.4%

Pity (guarantee)

The pity and the rising rates count gem draws only. When that grade or better comes out, its count starts over.

Pickup

Every 14 days one card of each of the Legend, Myth, Ancient, Transcendent grades becomes the pickup card. When a gem draw gives that grade, 50% of the time it is the pickup card; the other 50% is shared alike by the rest of that grade. After a non-pickup card of that grade, the next card of that grade is surely the pickup card. The current pickup cards are shown on the in-game draw screen.

A card's rate during a pickup (gem draw, by level)

The pickup card and each other card of its grade. After a miss, the next card of that grade is surely the pickup card (that grade's whole rate). Cards of the other grades are as in the per-card tables below, and buying new guns does not change the pickup grades' cards.

Legend (1 pickup of 9 cards)

LevelPickup cardEach other card (8)
Lv11.75%0.2188%
Lv22.11%0.2638%
Lv32.475%0.3094%
Lv42.835%0.3544%
Lv53.195%0.3994%
Lv63.555%0.4444%
Lv73.915%0.4894%
Lv84.275%0.5344%
Lv94.64%0.58%
Lv105%0.625%

Myth (1 pickup of 6 cards)

LevelPickup cardEach other card (5)
Lv10.6%0.12%
Lv20.745%0.149%
Lv30.89%0.178%
Lv41.035%0.207%
Lv51.18%0.236%
Lv61.32%0.264%
Lv71.465%0.293%
Lv81.61%0.322%
Lv91.755%0.351%
Lv101.9%0.38%

Ancient (1 pickup of 4 cards)

LevelPickup cardEach other card (3)
Lv10.125%0.0417%
Lv20.155%0.0517%
Lv30.185%0.0617%
Lv40.215%0.0717%
Lv50.245%0.0817%
Lv60.28%0.0933%
Lv70.31%0.1033%
Lv80.34%0.1133%
Lv90.37%0.1233%
Lv100.4%0.1333%

Transcendent (1 pickup of 3 cards)

LevelPickup cardEach other card (2)
Lv10.025%0.0125%
Lv20.045%0.0225%
Lv30.065%0.0325%
Lv40.085%0.0425%
Lv50.105%0.0525%
Lv60.12%0.06%
Lv70.14%0.07%
Lv80.16%0.08%
Lv90.18%0.09%
Lv100.2%0.1%

Rates per card

A card's rate is its grade's rate divided by the number of cards of that grade (without a pickup). “Base” in the tables means only the 4 starting guns. Buying a new gun with gems (Dagger launcher, Sniper rifle) adds that gun's weapon-line cards to the draw, so there are more Advanced, Rare and Hero cards. Dagger launcher line cards come only once the Dagger launcher is bought, Sniper rifle line cards only once the Sniper rifle is bought.

A card's rate by level (gem draw, with only the 4 starting guns)

The number after “÷” in a column is the number of cards of that grade. Buying new guns adds Advanced, Rare and Hero cards (see the counts in the per-card tables below), dividing each card's rate further.

LevelCommon ÷13Advanced ÷22Rare ÷20Hero ÷20Legend ÷9Myth ÷6Ancient ÷4Transcendent ÷3
Lv13.0769%1.3636%0.85%0.4%0.3889%0.2%0.0625%0.0167%
Lv22.9231%1.3436%0.861%0.4555%0.4689%0.2483%0.0775%0.03%
Lv32.7692%1.3232%0.872%0.511%0.55%0.2967%0.0925%0.0433%
Lv42.6154%1.3027%0.8835%0.5665%0.63%0.345%0.1075%0.0567%
Lv52.4615%1.2827%0.8945%0.622%0.71%0.3933%0.1225%0.07%
Lv62.3077%1.2627%0.9055%0.678%0.79%0.44%0.14%0.08%
Lv72.1538%1.2427%0.9165%0.7335%0.87%0.4883%0.155%0.0933%
Lv82%1.2223%0.928%0.789%0.95%0.5367%0.17%0.1067%
Lv91.8462%1.2018%0.939%0.8445%1.0311%0.585%0.185%0.12%
Lv101.6923%1.1818%0.95%0.9%1.1111%0.6333%0.2%0.1333%

The per-card tables below are for Lv1. At another level a card's rate is that level's grade rate divided by the number of cards of the grade (next table).

Rates per card, gem draw

Common · 40%

CardBase+1 new gun+2 new guns
Basic shot3.0769%3.0769%3.0769%
Ricochet3.0769%3.0769%3.0769%
Slingshot3.0769%3.0769%3.0769%
Snack3.0769%3.0769%3.0769%
Canned fish3.0769%3.0769%3.0769%
Mark3.0769%3.0769%3.0769%
Water gun3.0769%3.0769%3.0769%
Trap3.0769%3.0769%3.0769%
Wind-up mouse3.0769%3.0769%3.0769%
Moldy bread3.0769%3.0769%3.0769%
Cat punch3.0769%3.0769%3.0769%
Fish bone3.0769%3.0769%3.0769%
Thumbtacks3.0769%3.0769%3.0769%

Advanced · 30%

CardBase+1 new gun+2 new guns
Cannonball1.3636%1.25%1.1538%
Piercing shot1.3636%1.25%1.1538%
Fire bottle1.3636%1.25%1.1538%
Fireworks1.3636%1.25%1.1538%
Magnet shot1.3636%1.25%1.1538%
Bandage1.3636%1.25%1.1538%
Milk shield1.3636%1.25%1.1538%
Mirror shard1.3636%1.25%1.1538%
Rapid magazine1.3636%1.25%1.1538%
Next target1.3636%1.25%1.1538%
Wide shell1.3636%1.25%1.1538%
Slug1.3636%1.25%1.1538%
Prism lens1.3636%1.25%1.1538%
Focus lens1.3636%1.25%1.1538%
Oil spray1.3636%1.25%1.1538%
Ember1.3636%1.25%1.1538%
Dagger bundle—1.25%1.1538%
Thread needle—1.25%1.1538%
Steady aim—1.25%1.1538%
Vital shot—1.25%1.1538%
Lucky bell1.3636%1.25%1.1538%
Cracked brick1.3636%1.25%1.1538%
Snowball1.3636%1.25%1.1538%
Joker1.3636%1.25%1.1538%
Gear1.3636%1.25%1.1538%
Cardboard box1.3636%1.25%1.1538%

Rare · 17%

CardBase+1 new gun+2 new guns
Lightning can0.85%0.7727%0.7083%
Can opener0.85%0.7727%0.7083%
Finishing claw0.85%0.7727%0.7083%
Shadow claw0.85%0.7727%0.7083%
Catnip0.85%0.7727%0.7083%
Warm blanket0.85%0.7727%0.7083%
Sticky trap0.85%0.7727%0.7083%
Oil drum0.85%0.7727%0.7083%
Drum magazine0.85%0.7727%0.7083%
Chain fire0.85%0.7727%0.7083%
Storm shell0.85%0.7727%0.7083%
Steel slug0.85%0.7727%0.7083%
Spectrum lens0.85%0.7727%0.7083%
Power lens0.85%0.7727%0.7083%
Sticky oil0.85%0.7727%0.7083%
Ember wind0.85%0.7727%0.7083%
Fan blades—0.7727%0.7083%
Stitch daggers—0.7727%0.7083%
Long scope—0.7727%0.7083%
Streak shot—0.7727%0.7083%
Whetstone0.85%0.7727%0.7083%
Icicle0.85%0.7727%0.7083%
Chalk0.85%0.7727%0.7083%
Bottle-cap mine0.85%0.7727%0.7083%

Hero · 8%

CardBase+1 new gun+2 new guns
Whirlwind shot0.4%0.3636%0.3333%
Chain lightning0.4%0.3636%0.3333%
Ring of fire0.4%0.3636%0.3333%
Water cannon0.4%0.3636%0.3333%
Scanner0.4%0.3636%0.3333%
Lasso0.4%0.3636%0.3333%
Ice storm0.4%0.3636%0.3333%
Golden revolver0.4%0.3636%0.3333%
Silver bullet0.4%0.3636%0.3333%
Dragon's breath0.4%0.3636%0.3333%
Cannon slug0.4%0.3636%0.3333%
Aurora lens0.4%0.3636%0.3333%
Sun lens0.4%0.3636%0.3333%
Hellfire fuel0.4%0.3636%0.3333%
Will-o'-wisp0.4%0.3636%0.3333%
Blade bloom—0.3636%0.3333%
Golden web—0.3636%0.3333%
Crystal scope—0.3636%0.3333%
Comet round—0.3636%0.3333%
Piggy bank0.4%0.3636%0.3333%
Flea swarm0.4%0.3636%0.3333%
Megaphone0.4%0.3636%0.3333%
Recycling cart0.4%0.3636%0.3333%
Lightning rod0.4%0.3636%0.3333%

Legend · 3.5%

CardBase+1 new gun+2 new guns
Black hole shot0.3889%0.3889%0.3889%
Meteor shower0.3889%0.3889%0.3889%
Rainbow beam0.3889%0.3889%0.3889%
Ghost hunter0.3889%0.3889%0.3889%
Phoenix feather0.3889%0.3889%0.3889%
Cat's eye0.3889%0.3889%0.3889%
Laser pointer0.3889%0.3889%0.3889%
Freezer0.3889%0.3889%0.3889%
Soul lantern0.3889%0.3889%0.3889%

Myth · 1.2%

CardBase+1 new gun+2 new guns
Giant paw stamp0.2%0.2%0.2%
Galaxy laser0.2%0.2%0.2%
Eye of the storm0.2%0.2%0.2%
Ghost cat swarm0.2%0.2%0.2%
Ninth life0.2%0.2%0.2%
Reaper's bell0.2%0.2%0.2%

Ancient · 0.25%

CardBase+1 new gun+2 new guns
Moonlight hunt0.0625%0.0625%0.0625%
Meteor strike0.0625%0.0625%0.0625%
Primal claw0.0625%0.0625%0.0625%
Time-stop clock0.0625%0.0625%0.0625%

Transcendent · 0.05%

CardBase+1 new gun+2 new guns
Cosmic cat0.0167%0.0167%0.0167%
Dimension slash0.0167%0.0167%0.0167%
Nine suns0.0167%0.0167%0.0167%

Rates per card, summon ticket draw

Common · 44.5%

CardBase+1 new gun+2 new guns
Basic shot3.4231%3.4231%3.4231%
Ricochet3.4231%3.4231%3.4231%
Slingshot3.4231%3.4231%3.4231%
Snack3.4231%3.4231%3.4231%
Canned fish3.4231%3.4231%3.4231%
Mark3.4231%3.4231%3.4231%
Water gun3.4231%3.4231%3.4231%
Trap3.4231%3.4231%3.4231%
Wind-up mouse3.4231%3.4231%3.4231%
Moldy bread3.4231%3.4231%3.4231%
Cat punch3.4231%3.4231%3.4231%
Fish bone3.4231%3.4231%3.4231%
Thumbtacks3.4231%3.4231%3.4231%

Advanced · 32%

CardBase+1 new gun+2 new guns
Cannonball1.4545%1.3333%1.2308%
Piercing shot1.4545%1.3333%1.2308%
Fire bottle1.4545%1.3333%1.2308%
Fireworks1.4545%1.3333%1.2308%
Magnet shot1.4545%1.3333%1.2308%
Bandage1.4545%1.3333%1.2308%
Milk shield1.4545%1.3333%1.2308%
Mirror shard1.4545%1.3333%1.2308%
Rapid magazine1.4545%1.3333%1.2308%
Next target1.4545%1.3333%1.2308%
Wide shell1.4545%1.3333%1.2308%
Slug1.4545%1.3333%1.2308%
Prism lens1.4545%1.3333%1.2308%
Focus lens1.4545%1.3333%1.2308%
Oil spray1.4545%1.3333%1.2308%
Ember1.4545%1.3333%1.2308%
Dagger bundle—1.3333%1.2308%
Thread needle—1.3333%1.2308%
Steady aim—1.3333%1.2308%
Vital shot—1.3333%1.2308%
Lucky bell1.4545%1.3333%1.2308%
Cracked brick1.4545%1.3333%1.2308%
Snowball1.4545%1.3333%1.2308%
Joker1.4545%1.3333%1.2308%
Gear1.4545%1.3333%1.2308%
Cardboard box1.4545%1.3333%1.2308%

Rare · 16%

CardBase+1 new gun+2 new guns
Lightning can0.8%0.7273%0.6667%
Can opener0.8%0.7273%0.6667%
Finishing claw0.8%0.7273%0.6667%
Shadow claw0.8%0.7273%0.6667%
Catnip0.8%0.7273%0.6667%
Warm blanket0.8%0.7273%0.6667%
Sticky trap0.8%0.7273%0.6667%
Oil drum0.8%0.7273%0.6667%
Drum magazine0.8%0.7273%0.6667%
Chain fire0.8%0.7273%0.6667%
Storm shell0.8%0.7273%0.6667%
Steel slug0.8%0.7273%0.6667%
Spectrum lens0.8%0.7273%0.6667%
Power lens0.8%0.7273%0.6667%
Sticky oil0.8%0.7273%0.6667%
Ember wind0.8%0.7273%0.6667%
Fan blades—0.7273%0.6667%
Stitch daggers—0.7273%0.6667%
Long scope—0.7273%0.6667%
Streak shot—0.7273%0.6667%
Whetstone0.8%0.7273%0.6667%
Icicle0.8%0.7273%0.6667%
Chalk0.8%0.7273%0.6667%
Bottle-cap mine0.8%0.7273%0.6667%

Hero · 7.035%

CardBase+1 new gun+2 new guns
Whirlwind shot0.3518%0.3198%0.2931%
Chain lightning0.3518%0.3198%0.2931%
Ring of fire0.3518%0.3198%0.2931%
Water cannon0.3518%0.3198%0.2931%
Scanner0.3518%0.3198%0.2931%
Lasso0.3518%0.3198%0.2931%
Ice storm0.3518%0.3198%0.2931%
Golden revolver0.3518%0.3198%0.2931%
Silver bullet0.3518%0.3198%0.2931%
Dragon's breath0.3518%0.3198%0.2931%
Cannon slug0.3518%0.3198%0.2931%
Aurora lens0.3518%0.3198%0.2931%
Sun lens0.3518%0.3198%0.2931%
Hellfire fuel0.3518%0.3198%0.2931%
Will-o'-wisp0.3518%0.3198%0.2931%
Blade bloom—0.3198%0.2931%
Golden web—0.3198%0.2931%
Crystal scope—0.3198%0.2931%
Comet round—0.3198%0.2931%
Piggy bank0.3518%0.3198%0.2931%
Flea swarm0.3518%0.3198%0.2931%
Megaphone0.3518%0.3198%0.2931%
Recycling cart0.3518%0.3198%0.2931%
Lightning rod0.3518%0.3198%0.2931%

Legend · 0.45%

CardBase+1 new gun+2 new guns
Black hole shot0.05%0.05%0.05%
Meteor shower0.05%0.05%0.05%
Rainbow beam0.05%0.05%0.05%
Ghost hunter0.05%0.05%0.05%
Phoenix feather0.05%0.05%0.05%
Cat's eye0.05%0.05%0.05%
Laser pointer0.05%0.05%0.05%
Freezer0.05%0.05%0.05%
Soul lantern0.05%0.05%0.05%

Myth · 0.011%

CardBase+1 new gun+2 new guns
Giant paw stamp0.0018%0.0018%0.0018%
Galaxy laser0.0018%0.0018%0.0018%
Eye of the storm0.0018%0.0018%0.0018%
Ghost cat swarm0.0018%0.0018%0.0018%
Ninth life0.0018%0.0018%0.0018%
Reaper's bell0.0018%0.0018%0.0018%

Ancient · 0.003%

CardBase+1 new gun+2 new guns
Moonlight hunt0.0008%0.0008%0.0008%
Meteor strike0.0008%0.0008%0.0008%
Primal claw0.0008%0.0008%0.0008%
Time-stop clock0.0008%0.0008%0.0008%

Transcendent · 0.001%

CardBase+1 new gun+2 new guns
Cosmic cat0.0003%0.0003%0.0003%
Dimension slash0.0003%0.0003%0.0003%
Nine suns0.0003%0.0003%0.0003%

Summon companions

Price: 1 summon 300 gems, 10 summons 3,000 gems (Shop → Draw, Upgrade → Companions in the game)

GradeGem draw (Lv1)Summon ticket draw
Advanced60%70%
Rare28%25%
Hero10%4.5%
Legend2%0.5%
CompanionGradeGemsTickets
Lantern sparrowAdvanced30%35%
Turnstile pigeonAdvanced30%35%
Coin hamsterRare14%12.5%
Bubble turtleRare14%12.5%
Hard-hat mouseHero5%2.25%
Balloon fireflyHero5%2.25%
Little ghostLegend1%0.25%
SeagullLegend1%0.25%

A gem summon guarantees Hero or better within 30 summons and a Legend within 90. From summon 70, the Legend rate rises by 5 percentage points with each summon that misses it. Summon tickets have no pity. Companions of the same grade come out alike.

Grade rates by level (gem summon)

LevelStarts atAdvancedRareHeroLegend
Lv10 draws60%28%10%2%
Lv210 draws58.67%28.44%10.56%2.33%
Lv330 draws57.33%28.89%11.11%2.67%
Lv460 draws56%29.33%11.67%3%
Lv5100 draws54.67%29.78%12.22%3.33%
Lv6150 draws53.33%30.22%12.78%3.67%
Lv7220 draws52%30.67%13.33%4%
Lv8310 draws50.67%31.11%13.89%4.33%
Lv9430 draws49.33%31.56%14.44%4.67%
Lv10600 draws48%32%15%5%

The 2 companions of a grade share that level's grade rate alike. The per-companion table above is for Lv1.

Relic draw

Price: 1 draw 100 gems, 10 draws 1,000 gems (Shop → Draw, Upgrade → Relics in the game). No keys are given for free.

Each draw gives one relic piece. Every candidate relic is equally likely (1 ÷ the number of candidates). At first there are 8 candidates, 12.5% each. Buying guns and getting Rare or better unique cards adds candidates; the in-game relic screen shows the current number and rate.

Base relics (always candidates)

Relic
Worn Bandolier
Warm Lunchbox
Magnifier Monocle
Fuse Box

Gun relics (only for guns you own; the 4 starting guns from the start)

RelicGun
Golden CylinderPistol
Lucky ShellsShotgun
Mint CoilPiercing laser
Ember CapFlamethrower
Crescent Dagger CharmDagger launcher
Scope Lens MedalSniper rifle

Card charms (a candidate once you own that card)

RelicCard
Lightning can CharmLightning can
Can opener CharmCan opener
Finishing claw CharmFinishing claw
Shadow claw CharmShadow claw
Catnip CharmCatnip
Warm blanket CharmWarm blanket
Sticky trap CharmSticky trap
Oil drum CharmOil drum
Whirlwind shot CharmWhirlwind shot
Chain lightning CharmChain lightning
Ring of fire CharmRing of fire
Water cannon CharmWater cannon
Scanner CharmScanner
Lasso CharmLasso
Ice storm CharmIce storm
Black hole shot CharmBlack hole shot
Meteor shower CharmMeteor shower
Rainbow beam CharmRainbow beam
Ghost hunter CharmGhost hunter
Phoenix feather CharmPhoenix feather
Cat's eye CharmCat's eye
Giant paw stamp CharmGiant paw stamp
Galaxy laser CharmGalaxy laser
Eye of the storm CharmEye of the storm
Ghost cat swarm CharmGhost cat swarm
Ninth life CharmNinth life
Moonlight hunt CharmMoonlight hunt
Meteor strike CharmMeteor strike
Primal claw CharmPrimal claw
Time-stop clock CharmTime-stop clock
Cosmic cat CharmCosmic cat
Dimension slash CharmDimension slash
Nine suns CharmNine suns

Gear Chest

Price: 1 chest 300 gems, 10 chests 3,000 gems (Shop → Draw, Upgrade → Gear in the game)

Each chest gives one piece of gear. The grade rates follow the chest's own summon level with the card draw's table by level (below); the pity and the rising rates are those of the card draw, counted on chest opens only. Within a grade the 16 pieces (4 sets × 4 slots) are equally likely.

GradeGem draw (Lv1)Each piece
Common40%2.5%
Advanced30%1.875%
Rare17%1.0625%
Hero8%0.5%
Legend3.5%0.2188%
Myth1.2%0.075%
Ancient0.25%0.0156%
Transcendent0.05%0.0031%

Grade rates by level (the chest's own level, same table as the card draw)

LevelStarts atCommonAdvancedRareHeroLegendMythAncientTranscendent
Lv10 draws40%30%17%8%3.5%1.2%0.25%0.05%
Lv210 draws38%29.56%17.22%9.11%4.22%1.49%0.31%0.09%
Lv330 draws36%29.11%17.44%10.22%4.95%1.78%0.37%0.13%
Lv460 draws34%28.66%17.67%11.33%5.67%2.07%0.43%0.17%
Lv5100 draws32%28.22%17.89%12.44%6.39%2.36%0.49%0.21%
Lv6150 draws30%27.78%18.11%13.56%7.11%2.64%0.56%0.24%
Lv7220 draws28%27.34%18.33%14.67%7.83%2.93%0.62%0.28%
Lv8310 draws26%26.89%18.56%15.78%8.55%3.22%0.68%0.32%
Lv9430 draws24%26.44%18.78%16.89%9.28%3.51%0.74%0.36%
Lv10600 draws22%26%19%18%10%3.8%0.8%0.4%

One piece's rate is that level's grade rate ÷ 16. The table above is for Lv1.

The 16 pieces

Gear
Buddy Gloves
Buddy Collar
Buddy Boots
Buddy Bag
Musketeer Gloves
Musketeer Collar
Musketeer Boots
Musketeer Bag
Stairstep Gloves
Stairstep Collar
Stairstep Boots
Stairstep Bag
Matching Gloves
Matching Collar
Matching Boots
Matching Bag

Free gear

Gear won for free in chapter battles is not sold for gems, but its rates are published here too. The same 16 pieces as in the Gear Chest come out, and within a grade every piece is equally likely (one piece = the grade's rate ÷ 16).

A stage has only one first clear, so each of these comes once per stage. Stage drops and boss chests have no pity, and Myth, Ancient and Transcendent never come out of them.

Grade of a stage drop (when a piece drops)

GradeCh. 1⁠–⁠5Ch. 6⁠–⁠15Ch. 16⁠–⁠30Ch. 31+
Common75%60%45%35%
Advanced22%30%35%35%
Rare3%9%16%22%
Hero0%1%4%7%
Legend0%0%0%1%

Grade in a chapter boss chest (for each piece)

GradeCh. 1⁠–⁠5Ch. 6⁠–⁠15Ch. 16⁠–⁠30Ch. 31+
Common60%45%35%25%
Advanced30%35%35%35%
Rare9%16%22%27%
Hero1%4%7%10%
Legend0%0%1%3%