Case / 2026 · Live
Interactive civic toolCoalition Builder
An interactive Tweede Kamer built on the real 2025 election result. Pick parties, watch the seat chart fill and see whether you can cross a 76-seat majority.
What needed solving.
Coalition formation decides what actually becomes law, but for most people it is a black box of numbers and acronyms. Understanding it requires seeing the arithmetic happen.
How I got there.
Let the audience play the negotiator. Load the real seat counts, let them pick parties, and show the seat chart filling in until they either cross a majority or discover how hard coalition maths really is.
What it became.
A live coalition simulator on the real October 2025 election result, built as the flagship exhibit for his political and civic-tech work.
What it actually did.
Turns coalition formation from a black box of numbers into something the visitor plays. Loading the real seat counts and letting people try to reach 76 makes the arithmetic impossible to ignore.
- —Real October 2025 seat data
- —75 seats, 76 to win
- —Playable by anyone, no account
- —Shows how hard coalition maths really is
Built with what the case asked for.
Next.js · TypeScript
Live. Live and working.