X-rays interacts with atoms:
- 90° reflected on the edge
- absorbed if it directly hits

X-rays get in/out on the edges:
- shown by colored disk pair
- black disk if absorbed
- white disk if reflected: input and output are the same.

X-ray may be directly reflected by an atom on the edge of the grid.
Carefully look X-ray trajectory using the following example. Try by clicking the edges.

Game with 3 atoms is very easy.
In games with 6 atoms, it is possible that an atom cannot be reached by an X-ray.

Update Description:
v2.1:
- Added total played time, fixed the lock bug that occurs on some machines after a while.

v2.0:
- Added icons for direct access, changed background and display, better management of best score and timing.