Transistor is an action role-playing video game developed and published by Supergiant Games. The game was released in May 2014 for Microsoft Windows and PlayStation 4, and for OS X and Linux in October 2014, and iOS devices in June 2015. Transistor sold over one million copies across all platforms by December 2015.

In Transistor, the player controls Red, a popular singer in the city of Cloudbank, as she moves through the sci-fi-themed cityscape and battles robotic enemies collectively known as the Process. The game is presented through an isometric camera and features both real-time combat and a frozen, turned-based mode. The player is armed with a greatsword-like weapon, the titular Transistor, through which various powers called Functions are utilized against the enemies.

Transistor utilizes an isometric point of view. The player controls the main character, Red, as she travels through a series of locations, battling enemies known collectively as the Process in both real-time combat and a frozen planning mode referred to as "Turn()". Using Turn() drains the action bar, which refills after a short delay. Until it is full again, Red cannot use Turn(), or any other power (without a specific upgrade).  Red earns experience points after each battle, and may collect new powers (called Functions) from fallen victims of the Process.

Functions can be utilized in several ways. First, they can be equipped in one of four active skill slots. Second, they can be used as an upgrade to augment another equipped Function. Third, they can be equipped in a passive skill slot for a persistent effect during battle. For example, the Function Spark() may be used to fire an explosive attack, to split the effects of another Function, or to passively spawn Red's decoys. With a total of 16 Functions, there are a large number of combinations, allowing for a great degree of customization to fit different play styles.

Red can also collect and activate Limiters, which serve as optional debuffs during combat, but in turn increase experience gained. Both Functions and Limiters reveal minor parts of the story if used for a long enough time.