Three of them. The first two are board games, and the third is an L-focused prequel visual novel with escape room puzzles. The only one I've played a bit of in the past was the first one, Kira Game. It was in the vein of Werewolf/Mafia/Avalon, where one player was Kira, another was L, the rest were investigators, with the objective being to identify which player was Kira/L before being arrested/killed. I remember it seeming pretty underwhelming, as it didn't support online multiplayer, and local multiplayer required multiple carts (No download play, only 2 players).