Gem'X is a single-player casual puzzle game in which players manipulate tiles of different colours to match a control set. The core mechanic involves clicking on tiles to change their colours, with the selected tile advancing by two in a predefined sequence and adjacent tiles advancing by one, creating a strategic challenge to solve each level. In this game, players are presented with two sets of tiles, and the goal is to make the left set identical to the right control set through a series of colour adjustments. The game features multiple levels of increasing difficulty, requiring careful planning and pattern recognition. It stands out with its unique colour-shifting mechanic, engaging puzzle design, and compatibility across various classic platforms such as Commodore / Amiga, Atari ST/STE, and C64/128/MAX, offering a nostalgic experience for fans of vintage gaming and puzzle enthusiasts alike.