Thanks for actually playing the game through and finding the boss fight cheese!
Spoiler alert here:
The good ending conditions normally require a lot of tinkering with the scenarios' environments, but I understand that they're WAY too difficult to figure out for a normal joe. So here's the guideline:
-The hide and seek is solved by being never found - Which can be done by going out of bounds. In the first one there's a section to the right from the start where you fall through the floor, in the second one, you just go past the rooms until you teleport beneath the map.
-The bus scene can be solved by finding a gun under a seat and using it on the driver. He will stop the bus and therefore, you'll get out
-Finally, once you have all that done in a single run, you can find the correct code on a wall in a room on the starting hallway. Once that code is entered, you'll be sent into the same boss fight, but with a twist