If you’ve yet to try Valve’s mind-bending first-person puzzler Portal, you now have no excuse. The original Portal is currently free on Steam until September 20th.

Valve was inspired by teachers who’ve worked Portal into their classrooms and wants to encourage other educators to do the same. “One of the biggest challenges in teaching science, technology, engineering, and math is capturing the students’ imaginations long enough for them to see all of the possibilities that lie ahead,” the company said on the program’s website.

Videogames in the classroom aren’t entirely new, as games like Oregon Trail have been staples of computer classes since the 70s. But the complexity of modern games offer educators a myriad of possibilities, whether it is teaching problem-solving and teamwork in Minecraft or discussing the philosophical questions raised by Portal.

Meanwhile, you can benefit from Valve’s educational ambition by downloading Portal for free right now.

Source: Learn With Portals