Blind 75

The Blind 75 is the list that started it all. Originally posted on Teamblind in 2018 by Yangshun Tay, a former Meta Staff Engineer, it quickly became the most shared resource for coding interview preparation. The premise was simple: if you can solve these 75 problems, you understand every major pattern that tech companies test.

Unlike random LeetCode grinding, the Blind 75 is organized by topic. You work through arrays, then linked lists, then trees, then graphs, and so on. Each section teaches a core pattern that appears across dozens of interview problems. Two Sum teaches hash map lookups. Merge Intervals teaches sweep line. Number of Islands teaches graph traversal.

The list has stood the test of time because the patterns themselves do not change. Companies rotate specific problems, but the underlying techniques stay the same. A candidate who deeply understands the Blind 75 patterns can recognize and solve variations they have never seen before.

1. Go topic by topic. The Blind 75 is organized by topic for a reason. Finish all Array problems before moving to Linked Lists. This builds pattern recognition within each category before you move on.

2. Time-box each problem. Give yourself 20 minutes for Easy problems, 30 for Medium, and 40 for Hard. If you cannot solve it in that time, study the solution. Understanding the pattern is more valuable than struggling for hours.

3. Revisit problems you failed. Come back to unsolved problems after 3-5 days. Spaced repetition is how patterns move from short-term to long-term memory. If you can solve it cleanly the second time, the pattern has stuck.

4. Practice under interview conditions. Once you have solved 30+ problems, start doing mock interviews. An AI mock interview simulates real pressure with time constraints, follow-up questions, and detailed scoring so you know exactly where to improve.

Blind 75 (this page) is the original. 75 problems organized by topic. No time estimates, no difficulty progression. It is a checklist, not a curriculum. Best for people who want the classic list and prefer to work topic by topic.

Grind 75 is the successor by the same author. It reorders problems by difficulty progression, adds time estimates, and lets you customize your schedule. Best for structured, time-boxed preparation when you know exactly how many weeks you have.

NeetCode 150 doubles the coverage to 150 problems. It includes everything in Blind 75 plus 75 more problems that fill gaps in topics like greedy algorithms, advanced graphs, and 2D dynamic programming. Best if you have 2-3 months.

Our recommendation: if you have less than 6 weeks, do Blind 75 or Grind 75. If you have more time, start with Blind 75 then expand to NeetCode 150. And if you want to know exactly what your target company asks, check our company interview questions page.