Tell it what you want to improve and how many minutes you have. It builds the week.
Most people who try brain training stop because they never decided what to play or when. This builds a concrete week from two answers: what you want to improve, and how long you actually have. Everything it schedules is free, needs no account, and takes a few minutes.
Spacing is the single best-supported principle in learning research. Five minutes on six days produces more durable improvement than thirty minutes on one, for essentially every task on this site.
There is also a fatigue reason. Accuracy on memory and attention tasks falls off sharply after about twenty minutes, and a tired run teaches sloppy habits rather than good ones. A short session is not a compromise — it is the better session.
Playing only the game you are already good at is the commonest way people plateau. The plan draws from the whole category so you meet the same ability in different formats.
It stays inside the categories you chose, though. Variety within a goal is useful; variety across unrelated goals just dilutes the practice.
You will get measurably better at the games in the plan, usually within one to two weeks. That part is reliable and uncontroversial.
Whether that improvement spreads to everyday ability is a genuinely contested question, and the larger, better-controlled studies have mostly failed to find it. We would rather say so than sell you a routine on a promise the evidence does not support.
What is well supported is an association between staying mentally and socially active and better cognitive ageing. A plan you actually keep is worth more than an optimal one you abandon.
Five to fifteen minutes. Accuracy on memory and attention tasks drops off sharply after about twenty minutes, so longer sessions mostly practise being tired.
Five or six is the sweet spot. Spacing matters more than total time, so six short sessions beat two long ones.
Yes, and so is every game in it. No account, no email, no download and no premium tier.
Yes — change the inputs and it rebuilds instantly. Nothing is saved or locked, so there is no commitment to anything you pick.
They reliably improve your performance at the games in them. Evidence that this transfers to general cognitive ability is weak and contested, which is why this page says so rather than implying otherwise.