Licensed games based on licenses that are either obscure, regionally-specific, lacking in fandom-gamer overlap, or maybe just not game-ready. Or some other reason I guess. Really anything you wouldn't expect to see in a game. Medical dramas, soap operas, mascotless candies, acquired-anime-block logos, one-season cartoons, overhyped individual gimmick TV episodes, 2-minute movies-within-movies, so on. Some of these might have been wrongly assumed by some to be original IPs. No browser or app games, unless they have console ports. (Sorry, Grumpy Cat's Worst Game Ever)

Games without pages:
Cops (1994)
Animals of Farthing Wood (1996)
Top of the Pops: Mix Factory (1998)
The Fimbles: Fimbling Fun (2003)
Jakers!: Let's Explore (2009)
Oggy & The Cockroaches (Unreleased)
Literally everything on the Bubble DVD console