I have excellent colour vision but I still struggle with this because it's hard to remember which shade of green is which when flipping between the map and the legend
That said, in my color green they won't need a visa, but they will get a 30-day visa exemption. If they want to stay longer they'll need to apply for a visa.
It's interesting that they need a visa for travel to the US/Canada but are visa-free for Europe. Normally for most developing countries, if one of those regions require a visa, the others also do and vice versa. I would've thought the EU will require a visa.
Both Australia and Antarctica are a slightly darker shade of grey, I don't think they qualify for "visa required". According to this map, if you're brazilian, you can never visit Australia.