I will write down this expliot (well technically it is not exploit it is "clever use of game mechanics" as Blizzard would say) so it is out in the public, in hope it gets fixed.

Endless Score with Crusader, the easy mode.

This one takes absolutely no preparation (as the Bodyguard method), you can more or less just wing it.

On the SATAN Boss level, you can stand in the bottom left or right (I suggest left) corner and Satan cannot touch you there. His Bats will spawn regulary and fly to you. All you have to do is sit there, press Skip, and kill bats.

To do it with no sweat whatsoever you will need some good armor (plate) and some good weapon. They will deal, if they hit you, 2 damage or so. The Bats drop health potions fairly often, I had like 100 potions in my inventory when I decided it was enough.

Starvation? Not an issue since with Heal 3 you heal faster and regenerate mana faster than the starvation damage can do to you, and God will heal you pretty often as well. Occasionaly you will need to drink a healing potion, but there is so much of them that you can never run out.

That's it. You can sit there and grind the bats for hours until you get some rediculous score.

I have mastered a couple of weapons hitting Bats, then decied that it is just too boring and killed Satan.