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The same coloured shape appears every time — what changes is the question. Sometimes you are asked its colour, sometimes its shape, and the switch is where everyone slips.
Each question shows one shape in one colour, and above it a line telling you what is being asked: what colour, or what shape. Answer with the two buttons, which change to match the question — red and blue when the colour is asked, circle and square when the shape is.
About two questions in five ask something different from the one before. Those are the switch trials and they are the whole point: the shape on screen has not changed in kind, only the question has, so your hand wants to give the answer that was right a moment ago.
Three lives. A wrong button costs one, and so does letting the clock run out. Every twelve correct answers the time limit gets shorter, so the run always ends eventually.
The clock is real time, so leaving the tab does not buy you thinking time. Your score is how many questions you answer correctly, and the summary at the end shows your accuracy on switch trials against the rest.
Read the question first, always, even when you are sure you know it. The failure mode here is not misreading the shape — it is answering the previous question with perfect confidence. If you find yourself looking at the figure before the line above it, you have already lost the trial; the figure tells you nothing until you know what is being asked.
The buttons are your safety net, so use them. They change with the question: red and blue look nothing like circle and square. Glance at the buttons rather than trying to hold the current rule in your head, and the switch stops being something you have to remember and becomes something you can see.
Expect the switch rather than reacting to it. Roughly two questions in five change, which means a long run of the same question is not reassurance — it is the moment you are most likely to be caught. Players who go five or six in a row on colour build up exactly the momentum that makes the seventh, a shape question, cost them a life.
When the timer gets short, resist the urge to speed up your fingers; speed up your eyes instead. The time you lose is almost never in pressing the button, it is in the half-second of confusion after a switch. Cutting that means training the order — question, then figure, then button — until it survives the pressure. The end-of-run summary tells you exactly how much the switches are costing you compared with everything else.