In this mapset I included a few effects that I thought might be interesting to others. Here is one example involving "hidden ink."   If you want a hidden message to appear when a switch is pressed (or even when something like an invulnerability is picked up), you can use Boom's custom colormaps to highlight certain colors. This effect is like secret ink under a UV light. In Map03, there is a secret hiding an early BFG. To lower it, there is a combination lock that requires the right