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Word games (also called word game puzzles) are spoken or board games often designed to test ability with language or to explore its properties.

A word search, word find, word seek, word sleuth or mystery word puzzle is a word game that consists of the letters of words placed in a grid, which usually has a rectangular or square shape.

The objective of this puzzle is to find and mark all the words hidden inside the box.

The words may be placed horizontally, vertically, or diagonally.

Often a list of the hidden words is provided, but more challenging puzzles may let the player figure them out.

Many word search puzzles have a theme to which all the hidden words are related.

The puzzles have, like crosswords and arrowords, been very popular in the United Kingdom, and - also in common with these latter puzzles - have had complete magazines devoted to them.

A search game is a two-person zero-sum game which takes place in a set called the search space.

The searcher can choose any continuous trajectory subject to a maximal velocity constraint.

It is always assumed that neither the searcher nor the hider has any knowledge about the movement of the other player until their distance apart is less than or equal to the discovery radius and at this very moment capture occurs.

As mathematical models, search games can be applied to areas such as hide-and-seek games that children play or representations of some tactical military situations.

The area of search games was introduced in the last chapter of Rufus Isaacs' classic book "Differential Games" and has been developed further by Shmuel Gal and Steve Alpern.

The princess and monster game deals with a moving target.

Learning is the act of acquiring new, or modifying and reinforcing existing, knowledge, behaviors, skills, values, or preferences which may lead to a potential change in synthesizing information, depth of the knowledge, attitude or behavior relative to the type and range of experience.

The ability to learn is possessed by humans, animals, plants and some machines.

Progress over time tends to follow a learning curve.

Learning does not happen all at once, but it builds upon and is shaped by previous knowledge.

To that end, learning may be viewed as a process, rather than a collection of factual and procedural knowledge.

Learning produces changes in the organism and the changes produced are relatively permanent.

The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals.

The brain is located in the head, usually close to the sensory organs for senses such as vision.

The brain is the most complex organ in a vertebrate's body.

In a human, the cerebral cortex contains approximately 15–33 billion neurons, each connected by synapses to several thousand other neurons.

These neurons communicate with one another by means of long protoplasmic fibers called axons, which carry trains of signal pulses called action potentials to distant parts of the brain or body targeting specific recipient cells.