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First what you are going to do is make a sphere.

Then after that, you want to make a new material

Then you want to edit it, you can either double click the material or right click and hit edit

Then, you want to add a color gradient. On the menu that comes up, click COLOR and make sure the box is checked. Then from there you should see a box that has an arrow next to it (next to where it says Texture) Click that arrow and hit
Gradient
From there, you want to hit the box that says Shader, on the same screen towards the top, you should get a menu like this

Then you want to pick your colors, where it shows the little black box on the bottom of the gradient line, pick a color, along with the white box on the bottom, then move both of them towards the middle and bring them as close together as possible. It will end up looking like this (With the colors you chose)

Then we want to add a little shine to it. Hit the box where it says Specular, make sure it is checked. Then use these settings.

Width-100%
Height-20%
Falloff-0%
Inner Width-0%
After that, X out of the box, and where the material box is, click once and hold down ontop of the material, then drag and drop onto your sphere.
Your sphere should look like this

Note, i changed the angle of what you see on it.
Then save it, then it should be coming out like this

If you need help saving, go to the topic pinned in this forum

Congrats, you made a paintball