In Color Race 3D, you grow bigger by collecting stickmen that match your color. Avoid or absorb smaller stickmen of different colors to increase your size.

The main objective in Color Race 3D is to grow bigger by collecting stickmen of your color and avoid or absorb smaller ones. You must also navigate through obstacles and collect coins while racing towards the finish line.

Unfortunately, there is no option to change your character's color during gameplay. The color is assigned at the start of the race and remains consistent throughout the level.

If you collide with a stickman of a different color, you will shrink in size. It's important to strategically avoid these collisions to maintain your growth and stay competitive.

While there are no specific power-ups mentioned, collecting more stickmen and coins can help you grow larger and gain an advantage over other players. Keep an eye out for opportunities to maximize your growth.

To defeat the Stickman Boss, you need to be the largest stickman by growing as much as possible by collecting your colored stickmen. In the final showdown, being the biggest ensures victory.

There doesn't appear to be an explicit limit to how big your character can get. The key is to continuously grow by collecting stickmen of your color and outsize your opponents to win each level.

Your score in Color Race 3D is based on your final size relative to other players and the number of coins you have collected. The bigger you are and the more coins you have, the higher your score will be.