IQMAXXING

IQMAXXING is a free working-memory and attention trainer that runs in the browser without an account. It has 23 games: single, dual, quad and 3D cube n-back; digit span, Corsi blocks and complex span tasks; reaction time, go/no-go and Stroop; relational reasoning; and PASAT-style serial addition.

N-back runs are scored per stream from hits, misses and false alarms, with d′ on the result table, and the level steps up at 80% and down after three runs under 50%. New players can start with a guided 1-back run. Every run is saved to a history, charted on a stats page and exportable as JSON; an optional Google sign-in syncs that history across devices. There are no ads and no paywall.