Unlike a lot of old independently developed games, Everett Kaser has made a TON of other shareware games, mostly logic puzzles, which can be downloaded from his company website at http://www.kaser.com
I neglected to mention the First-Aid Stations which restore you up to 50 tags when touched. It's best to save these until you're either ready to leave the level... or desperately low on tags.
Below is a screenshot of what this game looks like when stretched to 1920x1050 with the HQ3X filter. (Which fits almost perfectly in a 1920x1080 screen space!) Click on the image to see it at its full size, and see just how awesome 640x350 EGA games can look with the right DOSBox settings on a widescreen display!
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