The latest free game giveaway in GOG's winter sale is an unexpected one for the festive season, but perhaps a game which captures the feeling of being trapped at a seemingly endless Christmas lunch with awful relatives: I Have No Mouth And I Must Scream. Nothing says 'bad family Christmas' like being tortured for 109 years by a sentient supercomputer which nuked humanity and keeps only five people alive to torment. The 90s point 'n' click adventure game is a grim one (so grim!), but one which does have its fans.