2. Marks:
Stare mark:
How to use: Press Custom2
Can be use in underwater: Nope
After the enemy was checked penguinator now know what is him weakness
and him improved Downwards Firethrower to Explosive targeted firethrower.
(example while enemy was checked)
if you killed the enemy with the mark the upgrade still in penguinator,
How to desactivate: Press Mark button again but with no enemies close to you.
Rage Mark(Insta kill):
How to use: Custom3 while you got 50 rings.
Can be used in underwater: Yes
Use with knowledge this cost 50 rings.
NOTE: enemies killed by instakill dont drop any score
and you need stay close to your enemy.