Does this match the one from N steps ago?
Boost Memory Maths Games for Teenagers Maths Games for Adults
Numbers appear one at a time. Press Match whenever the current number is the same as the one N steps earlier. In 2-back, you are comparing against the number from two positions ago while still taking in new ones.
It is genuinely uncomfortable at first, because it requires continuously updating what you are holding rather than just storing it. That updating is the defining feature of working memory as psychologists use the term.
This version: The standard challenge. Your best score is saved in this browser, so you can come back and try to beat it. Nothing is uploaded and no sign-up is needed.
This is honestly contested. Early studies suggested it improved fluid intelligence; larger replications have mostly found gains confined to the task itself. Treat it as an enjoyable challenge, not a proven intelligence booster.
Most people find 2-back manageable with practice and 3-back genuinely hard. Getting past 4-back reliably is unusual.
No. Only when the current number matches the one N positions back. Pressing when there is no match costs you.