In Chromatron you have to manipulate one or more laser beams with
reflectors, splitter and much more so that the targets are activated in the
correct manner.

For example, a level may have 3 static laser, one with red, one with green and
one with blue light. Then there might be a cyan, magenta and yellow target. In
this specific level all you have are three reflectors (mirror). Now you have
to place them on the grid so that the targets get activated correctly, meaning
say the cyan target must be hit by green and blue laser beams. Once all
targets are activated, the level is complete and you can start the next one.

The game offers 50 levels to master, increasing in complexity and difficulty
(more lasers, different targets, more manipulation devices, obstacles).

Chromatron