I've been ripping my hair out trying to get through Nodecore, a game for Minetest. It's basically minecraft but without an inventory menu and in-world crafting. You can't punch a tree down, but you can tear down the leaves and put together some branches to make an adze, which you can drop gravel on to cleave through one (1) log from a tree, which you can then carve with the adze to make planks, and then tool heads -- it goes on like that.

So far I've discovered stone-tipped tools and how to melt singular items like sand. I'm trying to figure out how to do concrete in such a way that isn't mindbogglingly tedious, and I still have to figure out how to find metal - torches don't last forever, you see, so spelunking is an expensive and time-consuming task. If you delve too deep without proper preparations, you're proper stuck in the dark. Subterranean pits can be save enders.