Free memory games,
hold one more thing in mind.

Short games that test how much you can hold in your head at once. Memory Match is the classic card-flipping pairs game, and Color Sequence plays back a pattern of lights that grows by one every round.

Chimp Test flashes numbers across a grid and then hides them, Number Memory shows a longer number each round, and Recall lights a set of squares for you to repeat. They get hard quickly, which is the point: rounds are short, and there is always one more step to reach next time.

All 5 memory games

Memory
Memory Match
Flip two. Remember what was where.
Memory
Color Sequence
Watch the colors, repeat the sequence.
Memory
Recall
The tiles flash. Put them back from memory.
Memory
Chimp Test
The numbers hide. Tap them back in order.
Memory
Number Memory
The number flashes. Type it back.