A big letter is drawn out of small letters — say, a big H made of little T's. The card asks for the BIG LETTER (gold) or the SMALL LETTERS (teal); tap that letter. The question keeps changing — answer as many figures as you can in 60 seconds.
A right answer earns 1 + the level, 1 more if the question has just changed, plus 1 for every 5 in a row (up to +3). A wrong answer costs 3 + the level and half a second.
Based on the Navon figures task: switching between the whole and its parts. It's the flexibility to step back and see the forest, then step in and check the trees — and back again.
You're a little slower right after the question changes. The end card shows how much — and it shrinks as you train.