This is one possible interaction with the BLACK BOX game. The actual design is up to you.

BLACK BOX Game
Written by ???????????

Enter the number of atoms? 4

Enter ray entry point? 1
ABSORBED
Enter ray entry point? 26
EXIT 15
Enter ray entry point? 28
EXIT 28
Enter ray entry point? 21
EXIT 4
Enter ray entry point? 7
EXIT 9
Enter ray entry point? 22
ABSORBED
Enter ray entry point? 0

Inter the cell numbers you think the atoms are in.

ATOM IN CELL ? 4
ATOM IN CELL ? 47
ATOM IN CELL ? 42
ATOM IN CELL ? 57
ATOM IN CELL ? 0 

The Black Box Atoms
+-----------------+
| . . * . . . . . |
| . . . . . . . . |
| . . . . . . . . |
| . . . . . . . . |
| . * . . . . * . |
| . . . . . . . . |
| . . . . . . . * |
| . . . . . . . . |
+-----------------+

You correctly located 2 of the 4 atoms in the BLACK BOX.