See the pattern before you move
Each track starts with a simple mental model: what you should notice on the screen before you change pointers or indices.
Beginners get context first—then practice.
Interactive patterns · guided for beginners
Practice interview problems with clarity and confidence.
Learn patterns by doing, not guessing. Work through guided, hands-on sessions on a live board, get clear feedback on each move, and keep improving with focused practice and short reviews.
We care about how well you recognize and apply patterns—not how many problems you rush through.
Guided path, step by step
Short intros explain the pattern in plain language—then you take over on the live board in the same workspace.
01Feedback on what you did
Hints respond to your last move so you learn the pattern—not a single trick answer or endless video rewatch.
02Depth when you’re ready
Optional reviews and timed reps build confidence. Go deep on one pattern instead of skimming dozens of problems.
03Come back before you forget
Short reviews bring the idea back while it still feels familiar—so recognition sticks in real interviews.
04If you're new to interview prep
The goal isn't a huge problem list—it's knowing which pattern fits the task in front of you.
Karkai walks you through one pattern at a time: what it looks like, how it behaves on the board, and how to recognize it again next week—without jumping between tutorials, editors, and flashcards.
“Interviews reward a calm explanation and a legal next move—not how many solutions you've seen.”
One guided workspace keeps you focused: same board, same feedback loop, and short reviews so the pattern stays retrievable when nerves show up.
Inside each pattern
Learn one pattern deeply—then the next.
Open a track, follow guided steps on the live board, and revisit the idea with short reviews. We optimize for understanding and recognition—not for racing through a problem count.
Guided beats, then you drive
Short stages demonstrate the rhythm, then hand you the board so your memory is tied to what you did—not a passive replay.
Recognition comes from reps you performed.
Coach when you want a nudge
Optional, concise tips grounded in your recent moves—useful when you’re stuck, easy to ignore when you’re in flow.
No endless chat thread.
Optional pressure, same pattern
When you’re ready, add timed reps on the same idea so the pattern holds up when the clock is real.
Depth on demand—not a new grind list.
Explain it like the interview
Practice stating the approach clearly—so your words match the moves you can already do on the board.
Confidence is verbal and technical.
Reviews that respect your week
Short summaries and gentle recall prompts bring the pattern back before it fades—without a punishing schedule.
Built for steady progress.
A cadence that fits real life
Understand. Practice. Revisit.
Start slow with guided steps, spend real time on one pattern, then let short reviews keep it fresh—timed reps stay optional until you want them.
- 01
Learn what the pattern looks like
Short explanations and demos build a clear picture first—so you’re not guessing why a move is legal.
- 02
Train recognition on the board
You perform the steps, compare outcomes, and read feedback tied to what you just did—so the pattern sticks to your hands.
- 03
Revisit before it fades
Light reviews and optional timed reps keep the same pattern retrievable next week—without starting a new marathon problem list.
What pattern-first practice feels like
Fewer tabs, less thrash, and progress you can point to—because the unit of learning is the pattern, not a leaderboard of problems.
- A visible path through one pattern at a time—intro, board work, and review in one place
- Hands-on reps with feedback on your moves—recognition tied to what you did, not what you watched
- Optional depth modes when you want them—without turning prep into a race through hundreds of one-offs
- Free tier includes one full pattern to learn deeply; Pro unlocks the rest of the library as it ships
Start with one pattern—really learn it
Even a short session helps when it's guided: open a track, move the board yourself, and let reviews bring the idea back. Sign in when you want progress saved across devices.