Walker is a side-scrolling shooter video game developed by DMA Design and published by Psygnosis for the Amiga in February 1993. The player controls a bipedal mech and is tasked with killing advancing enemies in stages set in multiple time periods. Development of the game began after the release of Blood Money, but was scrapped in 1990 because the game was not coming together. By the end of the year, development had recommenced with a redesign, inspired by sprites originally intended for Blood Money. Ian Dunlop and Neill Glancy designed the game, and Raymond Usher wrote its soundtrack. The game was released to positive reviews with praise directed at the game's graphics and sound, but reviewers were critical towards the repetitiveness of the gameplay. Amiga Power ranked it among their top 100 Amiga games of 1993. Gameplay Walker is a horizontal side-scrolling shooter that utilises 2D computer graphics. The player controls a bipedal mech to advance through the game's four stages, each consisting of two levels: 1944 Berlin, 2019 Los Angeles, contemporary Middle East, and 2420 Earth during "The Great War". Throughout the levels, the player uses the mech's machine guns to defeat waves of enemy infantry, tanks, and airships; the player advances to the next level upon killing all enemies. When the mech's guns are fired, the temperature indicator rises; when overheated, the guns must cool down over a short time before further use. The player has the ability to lock-on to enemies with their missiles. The mech's shield acts as the player's health and is depleted when enemies attack the mech. When the mech is destroyed, the player loses a life; when all three lives are lost, the game ends. At the end of each level, the player must defeat a boss. Unlike most side-scrolling games, Walker is controlled from right to left. The game features two difficulty levels: easy and arcade. Only the first two stages are playable in easy mode. Development DMA Design founder David Jones began developing Walker following the release of Blood Money in 1989. The inspiration for the game's mech originated in a sprite from Lemmings (1991) originally designed for Blood Money. The graphics and animation for Walker were designed by Scott Johnston, who later worked on Hired Guns (1993). Johnston, a freelancer at the time, wrote a small program to correctly render the walker's head in position, which could then be altered