When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
As you can tell by its name, a brain teaser is a riddle or puzzle, which is designed to challenge your logical thinking skills, while processing speed is a cognitive ability that could be defined as the time it takes a person to do a mental task. Brain teasers, logic puzzles and processing speed tasks are fun!