My DuckTales progress, The African Mines, and my level/game opinion.

Uncle Scrooge this time goes for the mines, where  live.

This level only requires us to take the key to the elevator, so we can go above to defeat theeeeee Terra-Firmian King, who calls diamonds, garbage rocks... oh dear.

Terra-Firmian King is a nice guy after all, but before that, we need to defeat him.

1-First roll is fast, you need to jump over, and next you need to jump upon the Firmian King (This is the only time you can hit him)

2- Secound roll he will roll over the map, making loopings until the 3rd, that he jumps off the boss's room nearby the other Firmians, and uses two types of trumpets:

  2.1 - Golden Trumpet, which calls giant rocks;

  2.2 - Blue Trumpet, that calls all the Firmians, you need to do pogo-hop;

After the defeat, Firmian king lend the garbage rocks to Uncle Scrooge and he let the Firmians to make small earthquakes....

We see again Uncle Scrooge with all the trophies, now with the Giant Diamond of Inner-Earth.

This level is very funny, now we don't need to collect/save anything, easier to say that, this level don't have pre-requisits to go to boss fight. 
Still easier than Transylvania and seems levels are getting easier for now. The game is so much fun, as I said the first time, reminds me of the old days.
This game has a mix of everything, nice jokes and dificulty.