The Casebooks of Ace Harding includes Game Boy ports of Déjà Vu: A Nightmare Comes True!! (previously released on Game Boy) and Déjà Vu II: Lost in Las Vegas. Déjà Vu is a port of a 1987 game that had been made for various systems. It's a classic detective story, with you waking up to a dead body with total amnesia - you don't know who you are, or how you got there, and you don't know who the corpse is, either. In Déjà Vu II, however, you *do* remember who you are, and you also remember that you owe some mobster a lot of money.
Randil and Spikestuff complete both cases in record time, which also features a minor improvement in Case 2, thanks to better optimisation.