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101 Studios was an edutainment startup that created video games to teach medical students, with their flagship game Antibody being a Pokemon-style game where players fought germs and bacteria. Despite professors liking the concept, they wanted highly customized solutions for their specific classes, making the business model unscalable. The startup failed to achieve product-market fit and pivoted to League of Fighters after 6 months.

140 Canvas was a failed startup that allowed users to create custom fake tweets and purchase them as canvas prints for £30. Despite getting 17,000 visitors from a successful YouTube influencer campaign, they only converted 20 sales, losing £145 total due to lack of market validation and a complicated user experience requiring customers to write their own tweets.

Adproval was a marketplace connecting bloggers and influencers with brands, founded by Matthew Anderson in 2011. Despite raising $300k and eventually generating over $200k in annual revenue through consulting services, the company failed after 6 years due to poor revenue model focusing on small commissions, lack of focus on the advertiser side, and founder burnout from depression and anxiety.

Autto.in was an on-demand doorstep car maintenance service operating in Hyderabad, India, founded by Deepak Murthy in 2017. The startup acquired customers through guerrilla marketing at apartment complexes but faced unsustainable unit economics with a $12 customer acquisition cost and long 10-12 month retention cycles. The business failed after burning $15,000 in initial investment against only $5,000 in revenue, eventually shutting down due to high burn rates and concern about the Indian government's announcement to phase out gasoline vehicles by 2030.

Awesomic is a designer marketplace that automatically matches design tasks with the best-fit designer, founded by Roman (ex-software engineer) and Stacy (ex-marketing/CMO). They validated the concept through email-based operations before building the web app in 3 days, and grew through word-of-mouth and conference visibility to 27 team members and 250+ clients completing 2,000+ design tasks in their first year.