YouTube star Mark Edward Fischbach, known online as gamer-comedian Markiplier, just raised over $74,500 in 18 hours by broadcasting himself playing Super Mario World nonstop.

Fischbach launched the crowdfunding campaign to benefit the Depression and Bipolar Support Alliance. Fans reacted by flooding social media with memes and encouragement. Twitter now has around 14,600 posts with the hashtag #markiplier, and Tumblr is awash with fan art.

I drew a quick sketch of @markiplier <3 The livestream was great today; it's amazing what ppl can do #markiplier pic.twitter.com/SHdk1TUIC7 — Desirae Dixon (@LegendJix) February 22, 2015

On his crowdfunding page, Fischbach wrote, “Mental illness is too often looked down upon as far as medical treatment goes. Too much doubt and misunderstanding surrounds these subjects and it needs to be addressed with the same seriousness as physical illnesses.”

Fans personally impacted by depression and bipolar disorder were particularly thankful.