Enter the environment
Each challenge defines the sandbox, available tools, constraints, and operating conditions. You are not just handed a prompt and asked to guess.
That loop is what trains strong systems, and it is also the cleanest way to train strong engineers. Public pages stay open. Authentication starts when you want to save work, run protected resources, or track progress.
A developer should be able to understand the product model in one scan.
Each challenge defines the sandbox, available tools, constraints, and operating conditions. You are not just handed a prompt and asked to guess.
Use your preferred model, agent stack, or coding workflow. Every meaningful move becomes part of the trace you can later inspect.
Evaluations score across weighted dimensions so you can see what worked, what broke, and what should change in the next iteration.
The value of the platform shows up in the second and third attempt, not just the first completion.
Jump into public surfaces now, then authenticate when you need persistence or protected resources.