Every word you miss in a game lands here. The deck brings it back right before you forget it.
The deck uses a simplified version of the SM-2 spaced repetition algorithm, the same idea behind Anki and SuperMemo. When a word is first missed, it arrives in the deck ready for review. Answer it correctly and the gap until the next review grows — roughly 1 day → 3 days → a week → two and a half weeks, because a word you remembered today is likely to stay for a while. Forget it and the interval snaps back to 1 day, so the word is retested tomorrow at the exact moment your memory of it is weakest.
This is the science of the “forgetting curve”: reviews timed at growing intervals beat massed re-reading, and they beat cramming, for long-term retention. Your deck lives only in this browser's local storage — nothing is uploaded, nothing tracked. Clear your browser data and the deck resets.
Want more words in your deck? Play Memory Match, Speed Recall, Falling Words, Whack-a-Word or Flash Recall with a topic that matters to you.