I earned 300 million coins from doing nothing over the past three months. For many people, that takes a lot of effort. However, I earned that by doing nothing and not even playing the game for a long time.
Necron’s Ladder
I bought Necron’s Ladders a while ago, before they got really expensive, which I’m glad I did since the prices shot up. The reason is that there is a limited number of Necron’s Ladders in the game.
The prices are around 400 million coins right now, and I have 2 of them.
So, I made over 300 million coins on both. Hopefully, as time goes on, they will continue to get more expensive.