anyway to switch back to dropdown list for game list when creating giveaway?

Name of the game if I may ask?

The game is missing HERE, so it got not bundled nor got it removed. It is for sale on steam http://store.steampowered.com/app/251970/
Seems like it got never added to the database

Edit: But thanks for the name, at least i got proof for the fact, that some games are missing here at all :D Had a longer discussion some days ago about a different case and the same topic came up. But well, almost everyone was telling, that there are no missing games in the Database. You just prove all of them wrong, hehe

Maybe something to do with a developer GA of it back on the old SG, 15000 copies I believe, followed by most of those winners re-gifting it

There were beta keys people were giving away if I remember correctly. I got one myself.

Sins of a Dark Age isn't allowed to be given away because all of the giveaways for it were people regifting the game from that 15,000-copy giveaway the developer did. Other games with such situations, as well as games where the keys have been abused, are all missing from the list for these reasons.