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Labels for the collection: 2 to 4 letters: how important this type of expansion is in the game. Example:

Breas; = Main focus of the game is breast expansion

But; = There is a few scenes of butt expansion or a long scene. While it may be missable, it isn't difficult to find it.

Be; = there is very little scenes of belly inflation and it's easily missable

Breas; = Breast expansion;
Butt;= Butt expansion;
Bell; = Belly inflation (liquid or air);
Dick; = Dick growth;
Musc; = Muscle growth;
Size; = Size growth;
Stuf; = Stuffing (putting solid items in belly through eating or other);
Weig; = weight/fat gain (That means the whole body is gaining a minimum of fat. If it's only on the belly growing, it's stuffing);
Vore; = same size vore (belly stuffing is implied);
Preg; = Pregnancy;

Warning Tags (to avoid if one of them is a turn off for you)

Furr; = Furry/Bestiality/Animal player character(Fur; = presence of humans or human-faced humanoid but half or more is still Furry; Fu; = little presence of Furry but player or important characters are furry);
Male; = Males only (Mal; = male focused: presence of females in secundary role; Ma; = there is sufficent female interactions but it's still focused on solo Male or Male/Male);
Herm; = Hermaphrodite/Futanari only (Her; = presence of pure female characters but it's mainly Futanari; He; = few futanari characters but player or important characters are futanari);

Fart; = Farting or burping (only unnatural amount and unavoidable in a scene. If the character burps 1 time after eating, it's not counted. If you can make a character burp only by massaging the belly, it's also not counted. For example, Fa; means there is some optional scenes that involves unavoidable Farting/Burping);
Scat; = Scat or watersport;
Aipi; = Heavily focused on AI-generated pictures (Aip; = Fetish scenes (or similar) are AI-generated but there is no fetish AI-generated content during gameplay; Ai; = Gameplay assets are AI-generated but there is no AI-generated fetish scenes);

3D: The game uses entirely (or nearly entirely) 3D pictures/animations for fetish scenes. If the game has a mix of 2D and 3D pictures, it won't be indicated. If the game has a 3D gameplay, it won't be indicated.

More or less SFW : Mainly joke games and similar. Not addressed to fulfill a particular fetish but also not really child friendly. Games clearly aimed toward a fetish but containing nothing risky will NOT have this label (example: toon characters, cute animations, ...)

Unfinished: the game is fully fonctional (in opposite to abandonned protypes) but isn't finished. It often means that the story is incomplete. It can either be because the author is in hiatus or has abandonned the project.
So, you can play and enjoy the game but don't expect a fulfilling ending.
The unfinished games are classified based on the current content. (Example: a planned full size RPG but with only 1 chapter of 1 hour will be considered as a medium game)

Warning: I class the games by gameplay, not by length.  A 30 min game with a single mechanic is still a mini-game, and a 3 minutes strategy game is a medium game.

Note: I try to not judge the quality of the games by their content (the fetish, the artstyle or the writing), except if I recommend them. I also try to be the more objective possible about the technical flaws.