Curly is fairly faithful to its source material, containing sounds and music from Cave Story, as well as Curly's two weapons, the red Machine Gun and the blue Nemesis, which it uses as part of its moveset, allowing it to fire both long-range and short-range shots. Its A.I. is quite transparent, usually firing long-range shots or charging up Power from afar, and using short-range shots, a kick or a Hyper when up-close.
Curly uses a four-button fighting system, two shots ((X)+(Y)) and two kicks ((A)+(B)). Armed with a Machine Gun and Nemesis. Its moves consist of kicks, shooting, a grab attack and some Specials and Hypers. Curly can charge up power by holding down (C)+(Z).
Its A.I. is customizable via a text file on a scale of 1-10, with 10 being the toughest. Depending on the proximity, Curly can fire long-ranged Machine Gun shots or charge up Power from afar, though when close, Curly could perform a combo move and also a Hyper if the combo move connects when there is enough power.
Palettes 11 and 12 have stronger Attack and Defence, and have Whimsical Star projectiles orbiting. Power starts at 1000 and can't ever be depleted. Palette 12 has constant Life regeneration.
This character has a config.txt file to adjust the A.I. level and such, listed below in order from the top:
A.I. Always On
Cut-in ON-OFF (Used for hypers, shows a portrait.)
Cartridge Clang Sound ON-OFF
Victory Fanfare ON-OFF (Used when Curly wins the match.)
This dark version of Curly Brace has greatly increased attack and defense, a minimum of 1000 Power which cannot be depleted and, depending of the config.txt file settings, has Whimsical Star projectiles orbiting the character.
This golden version of Curly Brace has the same abilities of Black Curly, however it has constant Life regeneration, making it even more difficult to knock out.
This character does not have any victory quotes, meaning it uses the screenpack's default.