Ghost Slime

Fades in and out. Can only be popped while visible.

The Ghost Slime fades in and out continuously, and you can only pop it while it is solid enough.

How it works

Its opacity cycles between about 10% and 100% roughly once per second.
A tap while the slime is below 50% opacity is rejected (“TOO FADED!”). It stays on screen and you can try again.
It is visible enough to hit about 60% of the time, so patience beats speed.
It is 10% of Casual Mode spawns and 15% of Defense Mode spawns.

Tips

Time the tap to the moment it brightens rather than tapping repeatedly.
In Defense Mode, treat Ghost Slimes as early threats. They are slow to deal with.