While almost all countries have 1 capital city, the country with the most capital cities is South Africa with Cape Town, Pretoria, and Bloemfontein, and the least is Switzerland with 0 capital cities.
Another fun fact is at the time of writing this I have 18 black borders on BTD6, 3 on expert maps, most recent I completed a few minutes ago is The Cabin, hardest is Infernal (imo) or maybe Quad.
Is a game called Bloons Tower Defense 6
As the game says is a "Tower Defense" game style, which consist placing a Lot of Warriors and Menchanisms represented as Monkeys and our target is make a perfect Defense LINE and avoid the Bloons(Ballons) get to the end of way track
it takes less inputs to look it up then to reply