From what I heard from one of the staff they used 3D models for the LOs then hand drew more than 15k frames using the 3D models as a base. This apparently took months to complete. Insane dedication by the Bibury Staff
@Vyclopia no, theres two parts, one where you defuse the bomb where you need the game, and the other part where you give the instructions is just a website (you could also pirate the game but yeah)