In v18, the "Common Nut Squirrel" pet has been buffed. Hatch eggs using the "Standard Nut Cracker" (Cost: 5,000 nuts). Do not waste currency on the "Golden Cracker" until you have at least 5 Common pets equipped.
Once you get into the game via an unblocked link, you need to play efficiently. Here is the fastest progression path for Version 18. nut simulator v18 unblocked