LeetCode has 3000+ problems. Too many. You need curation.

That’s where Blind 75, Grind 75, NeetCode 150, and NeetCode 250 come in. Each takes the sprawl and cuts it down to what matters.

But none of them work on mobile. And that’s a problem.

The Lists

Blind 75 — The original. 75 problems covering core patterns. Created by a Facebook engineer, shared on Blind (hence the name). Good if you’re short on time.

Grind 75 — Blind 75’s successor by the same author. Customizable by hours available. Better structure, similar coverage.

NeetCode 150 — Blind 75 expanded. Better pattern coverage, video explanations for each. The current meta for structured prep.

NeetCode 250 — NeetCode 150 plus harder variants. For when you want deeper coverage or targeting specific companies.

Which one? If you have 4-6 weeks, NeetCode 150. Less time, Grind 75 set to your hours. More time or targeting hard companies, NeetCode 250.

The Patterns

Every list covers the same core patterns. These are the building blocks:

Arrays & Hashing — The foundation. Two sum, anagrams, frequency counting.

Two Pointers — Sorted arrays, palindromes, container problems.

Sliding Window — Substrings, subarrays, max/min over ranges.

Stack — Parentheses, monotonic patterns, expression evaluation.

Binary Search — Sorted data, search space reduction, boundary finding.

Trees — Traversals, recursion, path problems. Shows up constantly.

Graphs — BFS, DFS, topological sort, connected components.

Dynamic Programming — The boss. Subsequences, knapsack variants, grid paths.

Master these patterns and you can solve problems you’ve never seen. That’s the point.

The Time

Realistic math:

NeetCode 150 at 2 problems/day = 75 days
Grind 75 at 2 problems/day = 38 days
Blind 75 at 2 problems/day = 38 days

But “2 problems/day” assumes desk time. Most people don’t have 1-2 hours at a computer daily for interview prep. They have jobs.

What they do have: gaps.

The Hidden Time

Your day:

Commute: 30 min
Lunch: 30 min
Waiting rooms: 15 min
Toilet: …10 min

That’s 1.5 hours. Every day. Currently wasted scrolling.

One problem on the train. One at lunch. Suddenly you’re doing 2/day without “finding time.”

The Gap

Here’s the problem: you can’t use this time.

LeetCode’s mobile app is their website in a wrapper. Same tiny textarea, same keyboard assumptions. NeetCode doesn’t have an app. Neither does Blind 75 or Grind 75.

Desktop editors assume:

Physical keyboard with easy {}[]();
Mouse for cursor positioning
Wide screen for problem + code side by side

None of this exists on a phone.

So people wait for desk time. It never comes. Prep takes 3x longer than it should.

The Fix

The editor needs to understand code structure, not just text.

Navigate by token, not character. Insert loops and functions by construct. Run tests offline.

That’s what we’re building. Curated problems, mobile-native editor, works on the tube.

Your commute becomes prep time. Join the waitlist.