In a few areas on the net you will find the Popup enemies, who resemble some sort of dog. They only have 10 HP, but every time you hit one, it will drop into its hole and pop out of another one. The more HP taken away, the faster it will go back into its hole. It is virtually impossible to defeat by the time it has at most 3 HP remaining, because when it goes into its hole, it will escape. An easy way to defeat it is to use the Anubis chip. You have to have completed the game at least once so you can get the Anubis chip from Pharoman. When you fight the Popup and have an Anubis chip to use, just set it down. The Anubis continuously depletes the enemy's HP (even multiple at a time). The Popup will automatically get hurt when it comes out of the hole. After it is defeated, you should get the rare Popup chip, which makes you invincible for a turn when not attacking (same as the Dropdown).