None (Singleplayer anomalies)

From WSGFWiki

Definition

A game with no singleplayer anomalies is just that - a singleplayer game without any major or minor singleplayer anomalies. This only applies if the full version of the game has been played by someone carefully looking for anomalies - it is not enough to play the demo and consider the full game to be anomaly-free based on a lack of them in the demo.

Examples

Half-Life 2 does not have a single glitch or anomaly that is specific to widescreen, or any inconsistancies in its support of hor +.