Interesting. I built a base in the "Crash Site" biome - which for me was basically low hills, uneven terrain, lots of Plant Protein, mushrooms and fibre plants - and the area was indicating 4.0r consistently. Is the Skillon crash site biome low hills for everyone? I will say however that rad accumulation didn't seem that fast, I think I was at about 0.6 body rads before I built the shower. I really did have the base built very early though, as it was my main goal once the Constructor (plus any collected ores) was placed and the O2 generators were working. Regarding the different easier / harder settings for radiation impact, O2 consumption etc. I usually use the default (medium) setting as I assume that represents the balance intended by the devs, with easy / hard being a personal preference modifier. I don't know exactly what the impact of these settings is, could the devs let us know? I.e. is it something like Easy = 50% O2 consumption rate. Medium = 100%, hard - 150%, and something similar with rads? Regarding other settings, I usually go "hard" in term of equipment, so I start with very little. I used to go "Hard" for NPC's too, but as that just made them bullet sponges I stopped using that as stuck with the default balance, which feels better, not simply easier. Edit: I just went back to double-check this and I suspect I may have had a UI issue. When I started, the area around my base was showing as 4.0r on the right-side panel - the same as the surrounding terrain. After leaving the planet and returning, this same area now shows at 2.5r - matching what others reported. Now, I did venture to the edge - and possible just outside - the "Crash Site" biome during the very early game, and I wonder if the UI updated to 4.0r and then didn't reset to 2.5r afterwards. Can't explain it, but this does explain why despite the reported 4.0r my radiation body radiation gain was low.