Test Subject series

The Test Subject series consists of two games. Blue is the hero is both games, and undergoes tests. Each game is a puzzle platformer. The series includes three games (one planned) and a spinoff, thus making the series have the most sequels to a nitrome game.

Test Subject Blue

 * Main Article: Test Subject Blue

Test Subject Blue was released on March 2nd 2011. In Test Subject Blue, the Professor is Testing a Blue Enzyme he created against his previously created Enzyme Orange Enzymes. In each level, the player controls Blue and has to navigate him to the Key Card, then to the Food Pill.

Test Subject Green

 * Main Article: Test Subject Green

Test Subject Green is the direct sequel to Test Subject Blue. It was released on May 10th 2011. In the game, the Professor attacked is while testing Blue against his newly created Green Enzymes. The person responsible for the attack is Doctor Nastidous, who loots Xeno Industries and destroys it, taking all the Professor's equipment as well. Like the first game, the levels are the same. New interactive objects, enemies and hazards are introduced.

Test Subject Green Sequel

 * Main Article Test Subject Green Sequel

Nitrome announced on Tuesday, May 24th, 2011 that they were planning on making a Sequel to Test Subject Green. It has not been confirmed what the plot of the game is, nor the villains and heroes, only saying that the game will be released in more than 2 months, possibly 3 or 4.

Test Subject Arena

 * Main Article: Test Subject Arena

Test Subject Arena is a spin-off of the Test Subject Blue series. The game has no plot or single player mode, rather it is Multiplayer game to be played with a friend. The game has 14 stages, the objective in each stage to deplete the opposing player's supply of Goo by destroying them. Player 1 controls a Blue Enzyme in Blue's Proto-Suit while Player 2 controls a Mimic Green Enzyme mimicking Blue's Proto-Suit. It is not Canon in the Test Subject Blue series, and is merely a Spin-off game.