Portal 2 is available for $4.99, 75 percent off its regular price (or $8.74 for two copies for co-op adventures. Octodad: Dadliest Catch can be added to your Steam library for $9.99, 33 percent off (or $13.33 for the game and soundtrack; which, shockingly, does include the Lionel Richie classic "Stuck on You"). Each sale ends at 10am Pacific on Friday, April 25.
In other deal-related news, the newly released music exploration game FRACT OSC is available for 10 percent off ($13.49) until 10am Pacific on April 29.
Octodad: Dadliest Catch (1/16/14)