Discover The Truth is a mysterious riddle added with the System Update.
Solving it gets you a Illuminati Stone.
There are 4 clues scattered around Growtopia. Each one of them rewards you one of these blocks Unknown Item Unknown Item Unknown Item Unknown Item
The "Kappa" Block can be earned by calling 41100-41199 in a Telephone, only one number out of the 100 is reachable and different for each person.
The text you got is depended on the number you got.
|VGF||41100, 41119, 41138, 41157, 41176, 41195|
|QNATREBHF||41101, 41120, 41139, 41158, 41177, 41196|
|GB||41102, 41121, 41140, 41159, 41178, 41197|
Once you get the 19 different strings, you need to put them in a ROT13 Decipher and put them in the right order.
VGF QNATREBHF GB TB NYBAR GNXR GUVF NAQ FZNFU GUR YRSGJNEQ WRYYL JUVPU VF NGBC GUR JUVGR QBBE !
ITS DANGEROUS TO GO ALONE TAKE THIS AND SMASH THE LEFTWARD JELLYFISH WHICH IS ATOP THE WHITE DOOR !
"ITS DANGEROUS TO GO ALONE TAKE THIS" is a reference to the first Legend of Zelda, where the old man gives you a Wooden Sword. You need to wear a wooden sword, place a jellyfish faced to the left above a white door and break it to get a "Kappa" block.
The "Edamame" Block can be earned by using Secret Of Growtopia to get this string :
SUPPORT means you need to go at http://growtopiagame.com/support and this is also hidden:
You need to shift each letter by the number in the string in the alphabet. You then get :
FIGHT VILLAIN WHO IS ON UPPER RIGHTMOST SPACE HEATVISION ICESHARDS SUPERSTRENGTH SHOCKINGFIST THEN RUN AWAY
Use a Henchman at the top right corner of a world, take these 4 cards and a random one, use them in ORDER, then press the run away button. Doing so will give you a "Edamame" Block.