The world of the weird WWII has 2 aspects that constitute both sides of one coin.
One half of it speculates about an alternative WW2 where the Axis and Allied scientists make scientific breakthroughs that change the course of history. This side of the coin focuses on inventions like armored walkers, rocketpacks, and power armor. On the darker end it includes medical experiments to create a race of enhanced supersoldiers, often at great cost of lives.
Together, these two aspects combine into the horrifying, yet enthralling setting for a Weird World War II. You may enter it if you dare, but remember... death is not the worst fate that can happen to you.