This level is obtained when you complete the First mission in the game called "Mystical Jungle" this is a tutorial level.
This level is pretty straight forward. It is a level used to teach you how to play the game so it's not too hard.
The platforming is very well done in the game and combat is not too bad. Follow what Splinter tells you to do and you will be fine.
This is the level that you will want to get your "Get your first coin" and "Clean Sweep" achievements.
I have included a walk through of the first level below.