A sticker (シール, Seal) is a collectible item in Super Smash Bros. Brawl, similar to a trophy. Stickers can be used in The Subspace Emissary to boost certain aspects or stats of a character. Additionally, stickers can be added to a background and made into a collage inside the "Sticker Album" menu.
There are 700 stickers. Collecting all of them will unlock the Stickers Trophy.
Compared to trophies, stickers are far more common, as there are 700 stickers total, and only a handful of trophies that can be found randomly. Stickers can be earned via the following methods:
The maximum number of stickers the player can collect per battle is 255, and exceeding this limit will get rid of the stickers the player had collected at the time. The reason for this limit is a wrapping issue; the per-battle sticker count is stored in a single byte, and when the count goes above 255 (binary 11111111) to 256 (binary 100000000), only the last 8 bits (digits) are stored, setting the count to 0.
On Friday, Jan 18th 2008, Smash Bros. DOJO!! announced that stickers can be used as power-ups. To do so, the stickers must be placed on the undersides of character trophies. Different stickers give different boosts, as well as some that are character-specific (most of them can be used by any character). Larger stickers give higher boosts, but take up more space on the trophy base. The statistical boost is only for The Subspace Emissary and does not apply to any other modes. Applied stickers can be moved around, but removing one discards it permanently (though they can be regained through playing).
Stickers with the same effects do not stack; e.g. if an Arm +13 and an Arm +20 are placed on the base of a trophy, that character will only receive the larger +20 boost to arm attacks, not +33, although an Arm/Leg sticker will stack with individual Arm and Leg stickers - i.e., an Arm/Leg + 10, an Arm +10 and a Leg+10 sticker will all combine to boost Arm and Leg attacks by 20. It is also possible for a single attack to fall under several categories, like Captain Falcon's Falcon Punch, which deals Arm, Specials: Direct, and Fire damage.
The stickers page can be accessed in The Subspace Emissary by pressing the 1 or B button on the level map and selecting the "Stickers" option to the left of the "Save" option. Also, using a Continue in The Subspace Emissary deducts half of the stickers currently earned in the level.
Each sticker has a single effect which may be any of the following. The number listed with the effect indicates how much the aspect is improved.
The largest category of stickers simply increases the damage dealt by the user's attacks. The exact meaning of the number given is unknown, but presumed to be similar to the resistance stickers (see below).
When used, these stickers reduce the damage taken by incoming attacks.
The meaning of the number is currently not well understood; it is not a simple addition or percentage decrease. Instead, it is currently believed to be something akin to this:
...where v is the value given by the sticker description and r is the damage multiplier. For example, a sticker with a reduction of 27 will cause attacks to be scaled to 0.675 of the original damage, or a damage reduction of 32.5%.
These stickers have varied and unusual effects.
In The Subspace Emissary, you can place stickers on trophy stands to augment the offensive and defensive abilities of your characters. But stickers must be applied neatly-- they must be fully on the stand and must not overlap. Sticker power generally corresponds to sticker size--bigger is better. But big stickers take up more room, so you must strike a balance.