Walker is a horizontally 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.

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".

Johnston, a freelancer at the time, wrote a small program to correctly render the walker's head in position, which could then be altered in Deluxe Paint.

[12] The Terminator (1984) and Akira (1988) influenced Glancy's design work, which he described as "the most complex pixel graphics [he] had ever made", due to the addition of motion blur and dynamic lighting.

[12] Dunlop found that the large scale of the game necessitated small enemies, which were partly inspired by the characters of Lemmings.

Dunlop explained that this allowed the player to maintain freedom of the weapons while simultaneously moving the mech and felt that it "gave the gameplay a bit more depth and interest".

When played on advanced Amiga models, Walker included a speech between the mech and its headquarters that had been recorded by Dunlop and Glancy over walkie-talkie.

[12] The game's original concept included an underground base that connected all of the levels, but this element was scrapped by publisher Psygnosis due to financial constraints.

[12] Glancy was also recruited to work on a sequel, Walker 2, which would have overhauled the visual quality of the first game and include a customisable mech.

[15] Mark Winstanley of Amiga Power praised the enemy animation, writing that he had "never seen ... soldiers die so needlessly and gratuitously".

[4] Amiga Power's Winstanley praised each element of the sound design, particularly lauding the subtle inclusions, such as music from enemy radios.