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.
On the other side of the coin, there is only darkness, for this is the occult side. In this world the nations of the second world war are not engaged in a conventional race of arms, but one of harvesting occult powers through the search for ancient artefacts - such as the lost Ark of the Covenant, the Spear of Longinus and the Holy Grail - and the awakening of old evils. This is a WW2 where the dead don't always stay dead, where men are made into beasts and where each faction strives to control powers they can barely comprehend.
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.