4 knights, Castle Crashers, Red Knight, Blue Knight, Green Knight, Orange Knight, cartoon style, vibrant colors, medieval armor, helmets, swords, shields, co-op gameplay, castle background, fantasy setting, action poses, dynamic lighting, side-scrolling, detailed textures, enchanted forest, magical effects, multiplayer, fun expressions, exaggerated features, 2D animation, arcade game, playful atmosphere, character selection screen, iconic design, whimsical.