Pro Progress·Focus·Animated insights details
Pro is for people grinding the list: you keep state (what you solved), access (every topic after trial), and animated insight walkthroughs (step-by-step playback with pacing and speed) — not just read-only pages.
Tick problems as you go; the nav dots and top bar show how deep you are in each topic. Everything syncs to your login — switch laptop or phone without starting from zero.
Problems only hides long explanations when you just want the table. Core set narrows each topic to minimum-coverage rows. Both follow your account so your next session matches this one.
Trial ends or access lapses — without Pro you drop to free chapters only. Pro keeps the full structured guide (tables, layers, and every problem row) so your prep isn’t fragmented.
Click any Key insight cell for the full overlay: curated steps, typewriter-style code replay, auto-advance, speed control, and visual frames where we ship them. It’s included with Pro so you can rehearse each problem’s story end to end.
Method Work the rows like a checklist
Every row is a question; order matters—each one assumes you’ve done the rows above, not a random playlist.
Why sequence matters
Every row is a question; order matters—each one assumes you’ve done the rows above, not a random playlist.
Why sequence mattersEach row is a question, stacked on purpose: the next row always adds something new on top of what you just solved. That’s the straightest path through the topic—no shuffling the deck.