This level, along with level 1, 2, 4 and 5 was released in 1.0 Official Release. This is the first level to not end in the theme it started, levels 1, 2, 4, 5 etc. ends in the theme it started. It's also the only level to be modified with 3 crowns in the 1.4.6 Update.
Themes (in order of appearance): Forest, Neon, Cosmos, Forest, Inferno.