Turn your study materials into a game you'll actually finish
Upload your lecture notes or textbook chapter. Each topic becomes its own card — original explanation, a tap to re-explain it simpler, then a quiz that adapts to what you miss. The dopamine to keep going is included.
Compound interest is the interest calculated on the initial principal which also includes all of the accumulated interest from previous periods. The amount accrued is determined by the formula: A = P(1 + r/n)nt where A is the final amount, P is the principal, r is the annual interest rate (decimal), n is the compounding frequency, and t is the time in years. Compound interest differs from simple interest in that the interest-on-interest effect produces exponential rather than linear growth of the principal balance.
Forget the formula for a sec. Imagine you have €100 and a friend pays you 10% interest a year.
After year one: you have €110. Easy.
But here's the trick — in year two, the 10% is calculated on €110, not €100. So you earn €11, not €10. The interest itself starts earning interest.
That's why €100 left alone for 30 years at 10% becomes €1,745 — not €400 like simple math would suggest.
Money grows on top of money. That's the whole idea.
From PDF to mastery in three steps.
No setup. No course catalog. Just your actual material, turned into something you can finish.
Upload your stuff
Drop in lecture slides, textbook chapters, your messy notes — anything PDF or text. Topics get extracted, structured, and broken into bite-sized cards.
We build your game
Each topic gets its own card with the original explanation, a "simpler version" button for when it doesn't click, and a quiz that adapts to what you miss.
Cram smart, not hard
Tap through topics, earn XP, keep streaks alive, master the parts you keep forgetting. Your exam, gamified.
Three layers. Same topic. Until it clicks.
Reading your textbook once doesn't work. Three layers — taught, re-taught, tested — until the concept genuinely sticks.
Your professor's explanation
The exact content from your materials, cleaned up and formatted. This is what your exam will actually test on — we don't replace it.
Same idea, simpler
Tap "simpler version" and the same concept gets explained again — with analogies, plain language, and real-world examples until it makes sense.
Adaptive quizzes
Get a question wrong? You'll see another version of it later. Master a topic? It moves out of rotation. The system learns what you don't know.
Here's what other students built
Click around. See if Cracked actually works for your kind of material.
Mitosis & Cell Division
The Derivative
First Amendment Doctrine
Yours could be next.
Upload your notes and see →Your exam is coming.
Get cracked.
Free to try. From €3 when you're ready for more material.
Build one for your notes →