Hidden System Mission Completion

It was already way-past midnight by the time Zachary returned to his room on the fourth floor of Madrid's infamous Hotel Riu Plaza España. He felt exhausted physically and mentally after playing more than 90 minutes of Champions League football against the tenacious Atlético Madrid side. He was eager to jump into bed and enter a long and peaceful slumber.

However, something unexpected but pleasant happened the next second to interrupt his plans. The all-familiar system notification resounded in his mind immediately after he finished locking the hotel room door behind him.

"DING"

"Congratulations to the user for unlocking and completing a hidden system mission associated with the 2014-15 UEFA Champions League," the system AI's apathetic voice sounded immediately after. "The user can check the mission completion details and rewards associated with the mission completion on the system interface."

"Eh!"