Classic NES
Balloooooooooooooon
Here's some more info
In Super Robot Wars Alpha, Shin Getter was created by a Getter Ray bombardment millions of times greater than what was used to created Getter Robo G. When it appeared, it caused EVA-01 Berserker to actually shut down in fear, then it proceeded to disintegrate EVA-03 with it's Stoner Sunshine attack, breaking through the AT-Field like it was a piece of paper. Then it was discovered that Dr.Saotome had actually set Shin's reactor output to just 10% testing power, and theorized that if Shin ever uses 100% of it's maximum power, the explosion created by the power up would consume and annailiate the entire universe.Then we have Anime Shin Getter, which is theorized to be at around 1% of it's maximum power.
Then we have Manga Shin Getter, which is powerful enough to alter space, create black holes, fly at the speed of light (faster than light in Shin Getter 2), and can throw multiple Stoner Sunshines at once. That is theorized to be Shin using more of it's power, but still no where near 100%.
As for Mazinkaiser, it's defence is without a doubt, THE most powerful armor in existence. It managed to survive being dropped from high orbit at immense speeds, and crashed onto Earth without slowing down at all. The explosion generated by the crash vaporized all of DaiShogun's generals, and the armor wasn't even scratched. And throughout all the Mazinkaiser OVA/Movie, it didn't suffer one scratch, except for a minor one at the head-cockpit. In SRW@Gaiden, Kaiser took a direct Stoner Sunshine from Shin, which didn't even affect it. That was just Kaiser's normal form.
Mazinkaiser has 3 different 'modes':
Normal Mode: It's weakest form. This is the form that is shown throughout most of the series.
Demon Mode: It's when Kaiser goes berserk. Much, much more powerful than Normal Mode, but Koji has no control over it.
God-Mode: Kaiser's final mode. It has NEVER been seen yet. Nothing, NOTHING seems to warrant it's use. From the threat of Neo Granzon interupting the Aegis Project and destroying most of mankind, to the threat of the STMC (Gunbuster aliens), the Zentradi invasion, the GUEST invasion, the Arrowgater invasion, Gun-Eden threatening to seal off Earth into another dimension, nothing, NOTHING seemed to be important enough for Kaiser to use God-Mode.
I was wrong Trickster Preist, Mazinkaiser in indestructable.