Portal Bundle, including both Portal and Portal 2, is now only $1.48 as part of the Steam Autumn Sale 2019. The sale will run until December 3rd at 10am PST.
Portal series is a first-person puzzle platform game and it is developed by Valve. The first game of the series, Portal was released on October 10, 2007 and the second game, Portal 2 was released on April 19, 2011. Both games are known for it's dark humor and they received mostly positive reviews. If you haven't bought the game yet, it's a perfect time to do so!