Go To Forest Floor and Click On A Tree, Dr. Nanosaurus Will appear and Tell you That You must Collect Letters Around The Island.
1. E - Croc Peninsula, On 1 Of The Tree
2. O - Rolling Hills Chamber (Prairie Pool), On Rexxy's Banner
3. T - Secret Temple (Dino Dunes), On The Floor
4. T - Jurassic Fort (Webo Ridge), On The Crystal Wall
5. E - Camposaurus Canvas Tent (Sub Alpine Forest), On The Floor
6. R - Ultrasaurus Tiki Lounge (Hillside Canopy), On The Honeycomb/Disco ball.
7. P - Buckland's Peak - On The Rock Shadow
Now Go Back To The Forest Floor, Drag Those Letter Until forming a word 'TREETOP'.
Congratulations! You've Unlocked Understory Layer!
~Irvine