Old Skool Is Koolz

[Gors]

Yeah, EpicWes is right. you should use less colors, and your sprite's height and width should be multiples of 8. Also, you can use more than 3 colors if you do one of those things...

1-Overlap a different sprite on the bigger one. This allows you to add 3 more colors to your sprite. But, the overlapping sprite needs to be small, because the NES can't handle a lot of sprites at the same time.

2-Divide the whole sprite in two small sprites. If your sprite has, for example, 16 width x 32 height, you can divide it in two squares of 16x16 each. You can use 3 colors and 1 transparency on each of those squares. This technique can be seen on NES Contra.

3-Divide the sprite in 8x8 squares. This one is time-consuming, but if you REALLY need a lot more than 3 colors, this might work. Each 8x8 squares can handle 3 different colors and one transparency. Though, you need to be really skilled to do this, because it works like a jigsaw puzzle: some pieces might not fit very well. Also, you can't exceed 25 colors, beucase this is the max colors possible in one screen (NES limitations). This technique works well for big pixelarts (like the title screen).