BB supports user created levels. Your only limits are these guide lines.
1. Only the colors R G P Y are accepted. (more will be added)
2. Each row supports 7 characters. (Any more then that, and you wont be able to beat the level)
3. Using Spaces count. (using a space between letters will count as a character)
4. You must follow this format when building levels (level(num)) ex. Level1, Level2.
Your also able to import your own music to the sound folder by following the same format about.