This topic is a blanket topic for any HERO secrets/easter eggs you may have. I started it to ask a question about a specific stage, and that is LEVEL 7. Near the end of the stage (probably 2 or 3 screens before the end) you can see something flashing within the ground. I have yet to uncover what is flashing under your feet, but I did try and plant dynamite above it, and did witness a strange anomaly with my character, but ultimately nothing happened.
To access the area you need to save some dynamite, which will require you to destroy a wall or two with your laser. I would love to demonstrate but I don't have any video capture hooked up to my console. I really want to find out what the heck that flashing object is. I guess it's possible it's just a glitch, but get this, if you die on the screen with the flashing 'thing', when you respawn, it's not there anymore!