LeetCode Guardians is a free extension for LeetCode, an open-source problem solving platform that aims to help you to learn and become better in your career. The extension comes with a masked code editor to help you solve the problem more efficiently and accurately. The masked code editor allows you to hide the solutions so that you first think through the solution and then choose to take a sneak-peek.

In order to solve a problem, you need to go through the questions and find the answer. The questions have different levels of difficulty, but this extension hides the level so that you won’t be discouraged just because the question was labeled as “hard.” You can set a timer if you want to try to solve every question in a limited amount of time.