# File lib/rubygame/sprite.rb, line 280
                        def collide_group(group, killa=false, killb=false)
                                sprites = {}
                                self.each { |sprite|
                                        col = sprite.collide_group(group)
                                        sprites[sprite] = col if col.length > 0
                                }
                                if killa
                                        sprites.each_key { |sprite| sprite.kill }
                                end
                                if killb
                                        sprites.each_value do |array|
                                                array.each { |sprite| sprite.kill }
                                        end
                                end
                                return sprites
                        end