Balls drop from the top, run down your track, and land in the Mint at the bottom, which turns them into money. The elevator on the right carries them back up to go again.
Balls: fancier balls are worth more. Track: buy machines like Plinko, a Pinball Machine and a Sky Cannon and put them in any slot. Each one makes the balls going through it worth more. Upgrades: faster drops, a faster elevator, a stronger Mint, more slots.
Scroll or drag to look around the track. Click a ball to flick it. Once you've earned a million, Reforge to start over with Golden Bearings, which make everything pay more forever.