For nine days, Mason kept going up and down the same wall in Hereford, until he had matched the height of Mount Everest.
The climber from Hereford scaled an 8 metre indoor climbing wall more than 1,100 times, climbing 8,848 metres after starting the challenge on 23 May.
He climbed the wall at Green Spider Climbing in Hereford 123 times each day until he reached his target on Sunday.
Mason took on the challenge to raise awareness of mental health issues in memory of James Plumridge, known as Jamo, who took his own life in September aged 22.
Speaking to BBC Midlands Today as he completed his final climb, Mason said: “I feel like I’ve achieved quite a lot from it and I just hope [that] it’s spread awareness.
“I felt quite tired sometimes and felt like I couldn’t do it, but I just kept pushing because I was doing it for James.”
Mason has been climbing since he was five years old and competes for the 270 Climbing squad in Gloucester.
He came up with the idea after seeing a scarf dedicated to Plumridge while attending a Hereford FC fixture with his dad, Rob.
Plumridge was a well-known fan of the club, and his death sparked a campaign across the town to raise awareness of mental health issues and the stigma linked to them.
Hayden Kirby is a member of JAMO, a clothing brand created in Plumridge’s memory that raises awareness of mental health issues and donates part of its profits to charity.
After watching Mason complete the challenge, Kirby said: “What Mason’s achieved is absolutely remarkable. I joined him for one climb and I was finished afterwards.
“I was halfway up the wall with him when I asked Mason to slow down, but he told me he already was and was waiting for me. He’s an incredible young man.”
Mason’s challenge was also aiming to raise money for Herefordshire Mind through a Just Giving appeal, which has so far received more than £1,400 in donations.
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