There's a topic like this in the TV and Movies section, so I thought it would be cool to make one here.
Self-explanatory, and the person who gets it right posts the next still.
-Reverse image searching is strictly prohibited, and the only decent way to curb it is to make your own screens using the "PRTSC" key and an image editor.
-No cropping allowed, be creative about making it challenging, avoid shots showing the game's HUD
-Do not post an image until the challenger has confirmed you guessed the right game.