Blueprint is a puzzle game for nailing the systems-design interview. Drag components onto a whiteboard, wire them together, and an AI interviewer grades your architecture — then unlocks the next, harder problem.
It feels like a real whiteboard — tactile, draggable, and yours to defend.
Pull clients, services, caches, queues, databases and CDNs onto the canvas from the palette.
Drag from a component's port to another to draw an edge, then label the flow — HTTP, writes, replicate.
An AI interviewer scores your design, calls out strengths and gaps, and unlocks the next floor when you pass.
Each floor is a classic interview problem, a notch harder than the last. After the core climb the tower branches — pick the Scale or Realtime track in either order, then conquer both to reach the summit.
The system-design hall of fame — ranked by floors cleared, then total score.
Playing is free and needs no account. Log in to keep your progress, cleared floors, and saved diagrams synced to your profile — on any device.