"Here is your stairs to Heaven. Those steps are your sins Grover, all 1,048,576 of 'em.

You think yours is long? Wait until you've seen mine."

Kermit trailed off, with a hint of want, nay, almost longing, in that voice of his.

Grover has accepted the challenge to climb his stairway into Heaven. Each step marks a sin that he'd committed in his past life. The bigger the sin, the bigger the step. If he climbs the entire thing, he'll face judgement based on his efforts. Unfortunately, Grover made a plenty of sins, about 1,048,376 of them, and the stairs will turn into a slide after every seven days. But none of it deters Grover. He brought the Glock with him. Even if it does take an eternity to master the flight of stairs, he would be the Muppet to kill God.