Intuitive combo and magic
system: Unlock
new combos and magical attacks as your character progresses through the
game. You have an almost limitless amount of combos to perform alone,
or with a group of friends.
Arena
mode: This mode allows players to battle each other
head-on with four unique modes to choose from!
Experience system: As
you fight your way through the various levels of Castle Crashers, your
character gains more experience points that will in return give you the
option to adjust your four main stats -- Strength, Magic, Defense, and
Agility.
Weapons weapons
weapons! Each player has the ability to unlock more than
40 weapons.
Animal orbs:
These
little companions add enhancements to your attributes. Each pet has
different abilities to benefit you, with various ways of unlocking each
one. Defeat a boss and steal his companion, dig them up, or buy them at
a store.
Treasure hunt:
Unlockable items, weapons, pet companions, and
characters are buried throughout the various levels of Castle
Crashers.
Stores:
Spread across the various worlds of Castle
Crashers,
every store has specific items to sell. Collect gold from killing
enemies, finding treasures, or opening chests, then take your collected
gold to these stores for some weapons, items, character unlocks, and
more!
Here is a link to the Original Thread from the NeoGaf forums
