Best free Linux action games

Action games are video games in which the player has to confront himself with "physical" challenges. Typically, in action games, the gameplay involves fighting moving enemies, shooting, finding and getting items, jumping. Concepts belonging to the action genre are the health (or lives) of the protagonist, bosses at the end of each level, linear gameplay. Some of the most popular action subgenres are fighting games, MOBAs, arcade games, sport games.