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Drill: repetitions on steroids
Some words keep slipping away however often you see them. Going over exactly those, several times in a row, takes more effort than an ordinary session, and that effort is what moves them into long-term memory. Psychologists call it desirable difficulty.
Drill is the exercise Taalhammer built on that idea. It collects the cards that gave you trouble, so that in a few days they are easy.
Every card you rate Difficult or Almost goes into the drill queue. On a computer you can see the queue in the panel on the right, under Drill, with the number of cards waiting.
To start, click Drill. On a phone, go back to the Learn screen and tap Drill. In a drill you go through these cards, some of them several times, until you have rated each one Easy.
Drill unlocks once five cards are waiting. You can start and stop it whenever you like, as often as you need. It works best with at least 25 cards; with fewer it is too easy. There is no upper limit, but 150 cards is already a lot of work. The most determined learners take on around 300.