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Cheat sheet — the discrete-math one-pager
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Guided gates each module behind the previous one's mastery (recommended — the ladder builds on itself). Free practice opens everything.
Start each module with plain-language basics; harder questions unlock as you get the basics down. Turn off to see every difficulty at once.
A question only counts as mastered after this many correct answers in a row — so a lucky guess never sticks.
Earlier modules keep mixing in afterward — especially questions you've missed.
Progress lives in this browser. Export a backup, or move it to another machine.
Built for offline use — no internet required. Math rendered with a bundled copy of KaTeX. When you finish, you're ready for the Theory of Computation review app.