iS: internal section (イズ ～インターナル・セクション～) is a video game developed by Positron and published by Square and released in 1999. iS: internal section is a tube shooter, in the same vein of gameplay as Tempest 2000 and N2O: Nitrous Oxide.

[1] A tube shooter is a type of shoot 'em up where the player controls a ship "looking down" a long tunnel or tube, and the player can move around inside the cylinder, shooting enemies that it runs into while moving.

The game featured twelve weapons, all of which have names that derive from the Chinese Zodiac.

[2] The graphics in the game feature flat shaded models, and the players ship and enemies are simple polygon shapes.

[2] iS: Internal section was released on January 28, 1999, for the Sony PlayStation and was published by Square.