My 49th: Starquake (Amstrad CPC464)
This game was brilliant, if a bit difficult. You play BLOB (Bio-Logically Operated Being) who crash lands on a planet full of hostiles beings and has to find all the pieces of a core needed to stabilise the planet (A total of 9 different pieces). It was open world, featured hovercraft, teleporters and the locations of the core and it's pieces would randomly change with each new game. Really ahead of its time the game area was massive, colourful and a joy to explore its 2D landscapes.
Map of Starquake play area: