Tag: The Power of Paint is a puzzle game for PC; it was created by a team of students from the DigiPen Institute of Technology in 2007/8. It received the Best Student Game award at the Independent Games Festival in 2009; as well as this, Tag prompted Valve to hire the students to work on the game, Portal 2. DigiPen is also responsible for the students, turned alumni, behind the original Portal.
Players navigate urban landscape, armed with a special paint gun. Each color of paint that the player can shoot is imbued with a different attribute; red accelerates the player's speed, green bounces the player upwards, and blue allows players to stick to surfaces.
The Gel based repulsion and propulsion systems seen within Portal 2 are the descendant of this game's concepts.