Some employers replace part of the aptitude test with short games. They look different from publisher to publisher, but many measure the same few skills, and memory is one of them. The games here are our own versions of two common task types.
Grid memory. Squares on a 4 by 4 grid light up one at a time. When the last one goes dark, you click the same squares in the same order. The sequences get longer as you go.
Two back. Letters appear one at a time. Press Match when a letter is the same as the one two letters earlier. A letter that repeats the one just before it's a trap.
Real games often score your speed as well. Here, get the target comfortably first, then work on going faster.