What was the first puzzle video game?

The first puzzle video game is often considered to be "Tetris," which was created by Russian programmer Alexey Pajitnov in 1984. However, prior to Tetris, games like "Colossal Cave Adventure" (1976) and "Maze War" (1974) incorporated puzzle elements. Tetris popularized the genre and established many conventions that influenced subsequent puzzle games. Its simple yet addictive gameplay has made it a timeless classic in the gaming world.