Every algorithm animates one step at a time — then asks you to predict the next step before it shows you. Solve it, rate it, and it comes back on a spaced schedule.
Every deck is a fixed 1280 × 720 stage — hand-built animated visualisers, code mirrored beside the graph, problems laid out two columns wide. It scales as one piece, so on this screen the body text would land at about 4px.
That is not worth shipping to you, so we are not going to pretend otherwise.