ArthurZ

Don't you think it's a little weird that the staff tried to conceal the original Black Hole Badges, but the new "Maelstrom" achievement's right there IN YOUR FACE? Just reach Level 100, or master 5...

1. Cộng đồng
2. General Khan Academy Questions
3. Black Hole Badges

The new Black Hole badge requires you to master 5,050 skills in order to get it (reach Level 100). Seeing as this badge isn't actually concealed as ??? like the others are, I'd assume it's possible.

1. Cộng đồng
2. General Khan Academy Questions
3. How many total skills are in Khan Academy?