Every Express simulation is a single self-contained JSON file (view +
css +
js).
This player embeds an open-source implementation of the USF runtime, so the sims run entirely
in your browser — no account, no cookies. We count anonymous visits, and comparing your score
with other players is opt-in (privacy).
Pick one from the catalog above, drag & drop a .json
anywhere on
this page, or use Open JSON.
© 2026 Kudzu Partners / Eureka Express — all rights reserved. The case is shared to be read alongside the simulation; unlike the simulations, it is not covered by the CC BY-NC-SA licence.