Beefy is a temporary effect given to the player by consuming a Sandwich in-game. The effect makes the player take on a larger, brawnier appearance, with the added effect of exchanging all weapons with the player's own raw strength. This form is used for boosted attacking capability and for removing certain obstacles, i.e the metal door in front of the entrance to the Industrial Castle. Sandwiches can be found from certain Fire Demons in Lava World (The ones fought at the bread-shaped gate and during the fight with the Volcano mini-boss, in both areas. They will re-spawn until the gate or volcano is destroyed, respectively.) Sandwiches can also be bought in shops.
In the beefy state, all melee attacks deal the same damage as a heavy attack, whether it's a light attack, heavy attack, or aerial attack. Throwing enemies does normal throwing damage.
Punching an enemy you're standing on top of once will cause you to pick them up. Throwing them will cause them to fly to the opposite side of the screen, knocking down any enemy they touch in the process. This is an excellent form of crowd control.
While beefy sandwiches are powerful tools, using them in combat is very unwise, and often times a death-wish on insane mode. (Try using a sandwich while the Troll Mother has a full field of baby Trolls spawned, on Full Moon, against the Industrial Machine, against the Frost King on insane mode or the Necromancer fight on insane mode if you want to learn the hard way that this is a HORRIBLE idea.)
Fighting style under the effects of Beefy consists of punching, kicking, and swinging of arms in a windmill fashion. The player is also immune to knockback from most attacks, with the exception of magic, larger opponents, and most bosses at a cost, the player takes less hits too kill in beefy mode.
If the player attacks a beefy enemy while they're still beefy, they'll begin parrying, which in beefy form appears more like wrestling, only the winner throws the other beefy high into the air, causing them to take fall damage.
Using aerial attacks while beefy is referred to as "The Windmill" and is not a form of Juggling.
The player can also grab basic enemies and throw them across the screen to cause damage to them along with anyone in the way of the missile minion.
The player gains invincibility frames for a short time after usage, so this item can help you in certain cases, e.g. when the dragon is about to breathe fire on you when you're in the air, you can use a sandwich to prevent it from hitting you and knocking you back and you can proceed to windmill it for rapid damage which is one of the fastest way to take on this boss. It can also get you out of eternal blocking when you are surrounded by trolls in the Troll Mum fight but you have to windmill constantly to prevent trolls from closing in.
- The metallic door with a golden lock at the end of the animal orb ark and the gate to The Flooded Temple are the only obstacles that cannot be destroyed while Beefy.
- If the player throws the Groom while in beefy form, a glitch will occur that causes the Groom to fly across the playing field in loops until he hovers above one of the benches, or until he's attacked again.
- If you eat a sandwich and let the timer get low, you can do a glitch by entering kissing mode from a princess and when the timer goes out, you can walk freely.
- In Arena mode, there is a Beefy game mode where you need to eat chickens to become beefy and defeat your foes. You do not do damage whilst not in beefy mode.