The board starts face down. Flip two cards at a time to find an optical term and its definition. A match stays face up; a miss flips back after a moment. Each pair of flips is one move, and the game ends when every pair is found. Your result shows your time, your moves and your accuracy (pairs divided by moves).

Choose a board size: Easy is 6 pairs (12 cards), Medium 8 pairs (16 cards) and Hard 12 pairs (24 cards). Play every category mixed, or narrow the board to one, such as anatomy, lenses or frames (a single category can have fewer pairs than the board size). The ABO Basic set has 45 pairs, ABO Advanced has 54 and NCLE has 53, and each game deals a new random board from them. Your wins, and your best time on each difficulty with its move count, are saved in this browser for each track.

Memory Match comes with every paid plan, starting with Basic. Each track needs a plan that includes it:

• ABO Basic: Basic, Advanced, NCLE or Complete plan
• ABO Advanced: Advanced or Complete plan
• NCLE: NCLE or Complete plan