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Test Subject Blue is a platform puzzle game developed by Nitrome. The game features a laboratory setting where players control a blue test subject navigating through a series of experimental chambers. The goal is to reach the exit in each level while avoiding various hazards and solving puzzles. The game is known for its unique mechanics, including the ability to use portals and interact with different elements within the chambers.

The levels in Test Subject Blue are designed to challenge the player’s logical thinking and reflexes. Players must carefully plan their moves, considering the placement of obstacles and the timing required to avoid dangers. The game’s graphics are colorful and cartoonish, adding to its appeal, while the sound effects and music enhance the immersive experience.

As players progress through the game, they encounter increasingly complex puzzles that require creative solutions. Test Subject Blue offers a rewarding experience for those who enjoy platformers and puzzle games. The game’s success led to the creation of sequels, including Test Subject Green and Test Subject Complete, which build on the original’s mechanics and introduce new challenges.