Many puzzle games involve a real-time element and require quick thinking, such as Tetris (1985) and Lemmings (1991).[1][2][3] Blockbuster, by Alan Griesemer and Stephen Bradshaw (Atari 8-bit, 1981), is a computerized version of the Rubik's Cube puzzle.In Boulder Dash (1984), the goal is to collect diamonds while avoiding or exploiting rocks that fall when the dirt beneath them is removed.[11] Pajitnov was inspired by a traditional puzzle game named Pentominos in which players arrange blocks into lines without any gaps.[20] Physics-based logic puzzle games include The Incredible Machine, Portal, The Talos Principle, Braid, Fez, World of Goo, and Cut the Rope, as well as projectile collision games such as Angry Birds, Peggle, Monster Strike, and Crush the Castle.Programming games require writing code, either as text or using a visual system, to solve puzzles.[22][23] In tile-matching video games, the player manipulates tiles in order to make them disappear according to a matching criterion.