Korean web-comic that I started reading recently.
Synopsis:
"What do you desire? Fortune? Glory? Power? Revenge? Or something that surpasses all others? What ever you desire, 'that is here'. Tower of God. Join Twenty-Fifth Baam as climbs each level of the Tower to find his beloved friend, Lahel. Facing from impossible missions to mind bending puzzles as he uses any means necessary to reach the top."
I basically read whatever came out in one sitting. Strongly recommended!