Hello. I might be making a TAS of this game. Currently working on making maps of the levels, and have half of the required ones done. In the process, I've noticed some potential improvements to area 4 in the current run by Nick_Andrews_:

1. You only need to speak to the commando in order to open the door to the boss room. The communication room isn't required. You still need to pass by it due to the way the platforms are set up, but you don't need to go inside.
2. There's a faster path to the communication room: Swing from the bottom of the platforms at the bottom of the level. Then you don't have to go up and down all of the platforms.
3. There might be a faster path to the boss room: When you first reach the waterfall, go up and to the right rather than down (around 09:20 in Nick_Andrews_'s video).

If you want, I can make videos demonstrating those things. The drawback to those route changes is that you won't get as many cartridges.