N-Back TestFree, no sign-up

Items appear one after another, and for each one you say whether it matches the item n steps back. To answer, you have to hold the last n items in mind and keep updating them, which is why it's used to train working memory (the ability to hold and work with information for a short time).

Press Match if the item is the same as the one 2 steps back, or Different if it isn't. The first 2 items have nothing to compare with, so they're a warm-up: press Next to move on. The 20 trials start from the 3rd item. On a keyboard, A = Match and L = Different.

In Grid, you remember which of the 9 squares in a 3×3 grid lit up. In ABC, you remember which of 8 letters appeared. They use different kinds of memory (spatial vs. verbal), so many people are better at one than the other. ABC 3-back is the hardest setting.

Yes. It changes at midnight Japan time. About 30% of the trials are matches. On the same day and version, everyone gets the same 20 trials.

By the number of correct answers (out of 20), most first; ties go to the faster time. You only need a nickname, up to 30 submissions a day. The server rebuilds the sequence and scores your answers itself, so the score you report isn't used.