Experimental Problem addon - Half-Life

Enjoy. I find it fairly challenging and tried to present a number of puzzles. I designed it as a microcosm of the Half-life experience. I tried to design the puzzles so that they are not too puzzling. There should be visual cues to lead you to solve the problem. For example, if you see a door and cannot open it, then you probably have to do something to do so, or you will see into an area you need to get into later. If you are dying too often, then try and find another way. Timing is crucial in a few areas. The ramp room stair was inspired by Leonardo Da Vinci who made a stairway like this in Chateau de Chambord (no firefights for him). This is my favourite part.