Gradients

For many many brushes, you can assign a unique block for each location, and adjust the mixing and falloff strengths using these buttons in the menu. Notably, the gradients can follow any shape without being restricted to a specific axis or straight line, unlike with other tools.

Here's what happens when both options are set to high values.

Here's an example with low falloff strength combined with high mixing strength.

Here's an example with low mixing strength combined with high falloff strength.

Here's an example with low value for both options.