Solved with yellow gun!

[Richard]

I managed to use the yellow gun to catch the black thing. It turns out you don't need red but it does make the end game puzzles significantly easier. My map doesn't even have the end game puzzles connected to the rest of the paths.

Has anyone else tried this?

[rpgamer987]

I recently did this as well. The puzzles are definitely a bit trickier to manage. Was also kinda disappointed in learning how paths don't connect on the map. I tried doing a run where I would attempt to solve everything I could before upgrading, but since the game wouldn't show new paths if I didn't have the gun it thought I needed, I started to wonder if I was successful in that attempt.

[Californ1a]

There is already a thread on this topic. http://steamcommunity.com/app/219890/discussions/0/864973981103837317/

It it entirely possible to 100% the game with just the yellow gun, although the visual links between rooms on the map are shown depending on which gun you have. If the puzzle would normally "require" red gun for the intended solution, then the visual link to the next room on the map will not show up if you solved it with only yellow.

[Richard]

Huh, that is pretty interesting. I didn't know there was an existing topic though.