How did Kratos get to Midgard in God of War Ragnarok?

God of War Ragnarok might've quelled a lot of questions from the previous installment, but the reason behind Kratos' arrival at Midgard remains unanswered.

Do you guys think we will get a flashback on how Kratos got to midgard in Ragnarok? Even though they kinda explained it in Lore and Legends. Thoughts? : r/GodofWar

God of War Ragnarok: The Story Points to Remember Before Playing - CNET

How Kratos Got to Midgard FINALLY REVEALED!!! (GOD OF WAR LORE)

I think this depicts how Kratos traveled to Midgard! How exciting to see this! :) I hope Kratos opens up about this method of travel to other worlds for the next game!

How did Kratos get to Midgard in God of War Ragnarok?

Why and how Kratos went to Midgard in God of War –

God of War Ragnarok: The Story Points to Remember Before Playing - CNET

How did Kratos get to Midgard in God of War Ragnarok?

God of War Ragnarok Midgard artifacts, collectibles and Odin's Ravens - Polygon

God of War Ragnarok Endgame Guide - What to Do After Ragnarok