Captcha Bank gives you the freedom to add Custom Error Message. You just need to navigate to the Message Setting Menu & there you have to type the error message you want to show in place of default error messages.
Logical Captcha asks some logic based question which protects from false login attempts. These logical questions are based on simple mathematical operations like Arithmetic, Relational and Arrange Order.
Captcha is mainly a collection of distorted images with text or numbers. The text or numbers are in such a way that bots or any computer program are not able to solve the captcha.