Different Unity projects.
1 - Cloak of Darkness implementation (C#) Player needs to drop his tool on the table of the room to be able to read the secret message on the floor of the bar. If he enters the bar 3 times without having dropped his tool in the other room, the player loses.
2 - Maze (C#) Player enters an underground chamber with a maze. He needs to reach the other side to be able to continue.