More founders. Too few practice rooms. Why we built Founders Tank.

Your runway is shrinking. Customers want a fix. An investor wants proof. Which decision do you make first?

That is the experience we wanted founders to practice before real money and people depend on their answer.

The scale is growing: the U.S. Census Bureau’s seasonally adjusted series recorded 5,634,736 business applications in 2025 versus 5,246,630 in 2024—a 7.4% increase. These are EIN applications, not unique founders or confirmed startup launches. Growth is uneven: 2024 was below 2023.

Source: https://fred.stlouisfed.org/graph/?g=1nSO0

Excellent founder knowledge is already public. YC’s free Startup School is one example. But intensive accelerator access is selective: YC says over 10,000 companies apply every three months, with a typical acceptance rate around 1%. Those populations differ from U.S. business applications; the figures are not directly comparable.

Sources: https://www.startupschool.org/ and https://www.ycombinator.com/investors

We built Founders Tank to make practical founder rehearsal easier to reach. You take the founder’s seat, weigh cash and customer tradeoffs, defend claims with evidence, hear distinct investor perspectives, and examine the consequences. The decision itself is the lesson.

We want current and future founders to practice critical thinking: what do I actually know, what remains uncertain, and what should I test next? A persuasive pitch without supporting evidence should face a challenge. An honest gap should lead to a better next step.

It is a game for practice, not a prediction of funding or startup success. It complements customer research and mentorship; it has no YC affiliation.

Take the founder’s seat—play the demo: https://demo.arena.sudhi.app/circuit

The screenshots below show actual Relay gameplay from our development build.

Which founder decision would you want to rehearse before it becomes expensive? After playing, tell us what felt realistic and where the game needs work.