Puzzle video games are a genre of video games that emphasize puzzle solving. The types of puzzles can test many problem solving skills including logic, pattern recognition, sequence solving, and word completion. Puzzle games focus on logical and conceptual challenges, although occasionally the games add time-pressure or other action-elements. Although many action games and adventure games involve puzzles such as obtaining inaccessible objects, a true puzzle game focuses on puzzle solving as the primary gameplay activity. Games usually involve shapes, colors, or symbols, and the player must directly or indirectly manipulate them into a specific pattern.