Am I allowed to use this game for speedrunning and if so how will I show it/mark it? Is it original game or definitive series?

That is a very good question. If it is allowed, I would assume it falls under the Definitive Edition, since it is a kind of remaster of the original games that came out before season 4 was a thing, and then the Collection was replaced with the DE

But it's up to the mods of they want to allow it or not, so I'm going to let them respond

The speedrun has separate categories for both definitive and the originals.

The collection seems to be its own remaster of the first 3 seasons + Michonne, seperate from the standalone games and the definitive edition. OP is asking whether runs on this version (the collection) of the games falls under the OG or definitive edition categories, or neither at all

https://walkingdead.fandom.com/wiki/The_Walking_Dead:_The_Telltale_Series_-_Collection

@AaronScotz

I'm not sure. Maybe ask SpaceDragon?

I actually bought it and played it myself, and it is absolutely different from both the 2012 version and the definitive version, and definitely warrants its own category since someone is asking for it

It likely runs similar to definitive, though. (S1 having the super walk speed)