actually sticks.
Most DSA courses feel like reading a math textbook in a noisy library.
This one feels like playing a game — one level a day, for thirty days.
SOUND FAMILIAR?
You’ve studied DSA. You still can’t do it.
You’ve watched 11 hours of YouTube on recursion and still freeze when an interviewer says “can you do it recursively?”
You’ve read the same Big-O cheat sheet six times. You still pause for two seconds before you say “logarithmic.”
You know what dynamic programming is. You still don’t trust yourself to pick it on a brand new problem.
Reading about DSA isn’t the same as doing DSA. This site forces the second one.
Don’t take our word for it.
Break the array yourself.
Push. Pop. Insert. Search. Every page on this site has a widget like this one — concepts you can poke instead of memorize.
Think you’ve already got the basics?
Prove it. One question. No login, no judgement, no shame.
Why this beats that other course you keep restarting
Six choices we made on purpose to keep you coming back tomorrow.
See it. Don’t memorize it.
Animated array shuffles. Step-by-step algorithm runners. Memory diagrams you can hover. The concepts that hide in textbook prose suddenly look obvious.
30 minutes. Not 30 hours.
Each day is one sit-down. No marathon. No “come back tomorrow when you’re fresh.” One topic, one walkthrough, one set of problems. Close the laptop. Repeat tomorrow.
Shaped like the interview.
The patterns FAANG actually asks. Solutions in C++, Python, and Java side-by-side. Difficulty badges so you know what you’re walking into.
Voice you can stand.
Opinionated. Occasionally funny. Allergic to academic hedging. Learning that doesn’t feel like a homework assignment from someone you don’t like.
No paywall. No signup.
Open the page. Read it. Close the tab. Skip a day. Come back in a month. It’s a book, not a SaaS — and the source is open on GitHub.
Built for tinkerers.
Every visualization is a live React component. Want to see what happens with a weird input? Type it in. The site bends to your curiosity.
Here’s the whole map.
Every tile is a self-contained day. The green dots are already written.
Every day has the same four beats.
Predictable. Bingeable. Quietly addictive.
An analogy. A diagram. The “wait, that’s it?” moment.
Step through the algorithm. Pause. Rewind. Run it backwards.
C++, Python, Java side-by-side. Pick your weapon.
Curated interview problems. Reveal solutions when you’re ready.
The 30 days start whenever you click.
Not next Monday. Not after the holidays. Not when you “have more time.” Right now, one tab, no setup.
Begin Day 1Free · Open source · Bookmark and bail any time