Hello,
there is a Method to change the value of for example a Iron Cube!

1 First you open Cubeworld and load a world!

2 Then you open Cheatengine and select the cube.exe process!

3 Now do the first scan with the value of your item!
4 Then go ingame and drop 1-2 of the item!

5 Next scan with the new value!

Now you repeat 3,4 and 5 so long until one value displayed!

Alright, now right click on the value and "Add selected addresses to the addresslist"!

After this must be the value at the bottom of the Cheat Engine. Select and press Enter! Now change the value with an number how you want (if you change the number too high the game will crash & the Character is buggy)!

Thanks for ready and sorry for my bad English