There are 20 units, from the chess board itself to your first real game. Each one starts with Jensen explaining the idea, then a few tasks: tap a square, collect ⭐ stars with a piece, answer a quick question, find the right move, or play a position out against Jensen. Pidge the pigeon supervises.
Finish a unit to open the next one. Get tasks right on your first try for 10 points (5 if you needed another go) and up to 3 stars. Stuck? Press HINT: the first press circles the piece, the second circles where it goes.