Plan game scene

Well my plan for the game is that for my boundary instead of using natural boundary's like mountains, hills, and trenches I will use a wall that surrounds my whole scene this will work as my boundary. There will also be a lot of things inside the wall which  would be the city. Some of the things would be house complexes, buildings, gyms, and McDonald's. For my hidden objects they will be cleverly hidden throughout my game scene so that it  will be hard for the characters to find them. Some of the hidden objects I will use include would be banana, strawberries, broccoli, almonds brown rice, and carrots