Harsed
This is a vanilla+ style modification that significantly increases the difficulty of Minecraft gameplay. Different players may perceive it differently: some will consider it simply challenging, while others will see it as truly cursed, but essentially it combines both qualities.
The mod offers a completely new level of difficulty with countless inconveniences and additional challenges. A more detailed explanation of the mechanics is available on the creator's YouTube channel, but here's a brief overview for now:
Game Beginning
From the very start, you'll need to act FAST! After the first day, almost all monsters receive enhancements in the form of Strength and Resistance effects at level 2. Begin by harvesting leaves and dirt - both of these blocks drop items necessary for progression. Leaves, for example, yield Wooden Sap, which can be processed into planks and sticks.
Mid-Game Stage
After obtaining cobblestone, create a pick (specifically a pick, not a pickaxe - that comes later). Then mine iron and other essential resources: coal, gravel, and others.
You'll have to discover the remaining mechanics on your own - that's part of the creator's design!
Important Note: For Harsed versions 2.1 and above, installation of the GickoLib3 library is required.