All I can think about is Legend, Indy said that it will be a game that he already told us before. I don't think it's the Laxius Game because Laxius games are big and takes much more work to make than other Indy's games.
Thank you! Not much love for Little Hearts so far but it's probably because so little is known about it (granted, still more than what the Mystery Game boasts of ahaha).