Sacred Haven of Debauchery

Well, Battletoads and Double Dragon can still be completed, although it was difficult in childhood, and I certainly didn't finish them. I passed it for the first time a few years ago with a friend (because he learned it well and could do it), and even then, I died on the final boss.
But the regular Battletoads... not everyone will get past the 3rd level, that's for sure. Although now, of course, some retro gamers complete it without warps, but in childhood, it was impossible, and even now it's quite difficult. Moreover, there are many places that require memorization. My friend and I reached the iron snakes, where I died, and he continued on his own (I don't know how far). Maybe I'll try playing it alone sometime; maybe it will be easier, at least on the jumping sections.