The real engine, wired to the screens. Tap a circled place to go inside it; tap a document to open it.
Nine schemes. Each one is its own world, not a tint of the last — and the travellers' route colours change with it, so nobody's line disappears into the ground.
Everything here is computed, not written. The routes, the times, the shares and both money figures come from the same code the tests run against. Prices and flight numbers are invented; the arithmetic and the geography are not.